Epoxy okay on mahogany?

Bearing in mind that opinions here are sometimes worth about what you
pay for them, for my .02 cents I would encourage you to fill the seams
with a polysulfide caulking like BoatLife or SikaFlex. These products
come in standard cartridges and can be applied with a standard caulking
gun, although in a similar situation I chose to invest in an air driven
caulking gun, because I already owned a compressor and figured my hand
might fall off after i squeezed out 2,700 lineal feet of seams.

These products are made for seams, and they will stay more or less where
you place them, ie since your boat is too big to turn over, you are un
the position of having to force a semi liquid like epoxy mixed with a
filler up hill in order to get it into your seams. The polysulfide on
the other hand is mixed to s consistency, and is sticky enough that you
can work from underneath it without ending up wearing it.

You can get cartridges to fill with epoxy, and you can get slow curing
hardeners, but I still think it would be easier to use a different
product like BoatLife.

If you have some *small* areas of rot, you can solidify them with epoxy
sometimes. You need to drill some holes in the wood, use the plastic
syringes and later heat the area with a heat gun which helps thin the
epoxy a little and drive it deeper into the wood. You can find more
information on that process at < <a style='text-decoration: underline;' href="http://www.westsystem.com" target="_blank">www.westsystem.com</a> >

Good luck.

Jonathan


Jason wrote:
 > A while back i asked about if it is okay to put fibreglass below the
 > waterline of my 28 foot mahogany lapstraked carver mariner.
 > Overwhelmingly the response was NO.
 >
 > heres my next question,
 > Would just using epoxy to coat all wood surfaces of the hull be okay?
 > or does anyone see anything wrong with it? i need the quickest,
 > easiest way to make this boat waterproof so i can get a month out of
 > it this year at least. it has already been sanded down, just waiting
 > for my next move.
 >
 > any help is appreciated.
 > thanks,
 > -Jason<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:

 > A while back i asked about if it is okay to put fibreglass below the
 > waterline of my 28 foot mahogany lapstraked carver mariner.
 > Overwhelmingly the response was NO.
 >
 > heres my next question,
 > Would just using epoxy to coat all wood surfaces of the hull be okay?
 > or does anyone see anything wrong with it? i need the quickest,
 > easiest way to make this boat waterproof so i can get a month out of
 > it this year at least. it has already been sanded down, just waiting
 > for my next move.
 >
 > any help is appreciated.
 > thanks,
 > -Jason

The thing about adding a light glass cloth to the epoxy is not strength
but to get an indicator telling you how much epoxy you have applied.
Wetting out the glass will ensure you got a certain minimum epoxy
thickness everywhere. This is much, much harder to achieve without
the glass.

--
====================================================================
Martin Schöön                    "Problems worthy of attack
                                     prove their worth by hitting back"
                                                              Piet Hein
====================================================================<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

=?iso-8859-1?q?Martin_Sch=F6=F6n?= (me@privacy.net) writes:
 > On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:
 >
  >> A while back i asked about if it is okay to put fibreglass below the
  >> waterline of my 28 foot mahogany lapstraked carver mariner.
  >> Overwhelmingly the response was NO.
  >>
  >> heres my next question,
  >> Would just using epoxy to coat all wood surfaces of the hull be okay?

I missed the earlier discussion, but why would you want to coat all the
wood surface?

I assume the previous replies recommended against it because of the lapped
strakes making it too difficult to lay the cloth on the hull.

I think all you really need to worry about is sealing the seam where the
planks overlap and that I assume can be done do with a flexible sealant
and a caulking gun. The wood will flex both from the motion of the boat
and the swelling with moisture. Epoxy might work. I have both epoxy and
polyester sealing seams on my boats but then they are very small so don't
flex, are plywood which is more stable, and are out of teh water when not
in use. You might get away with sealing the seams with epoxy. I spread a
small bead along the seam with a toothpick and do it twice. Then paint or
varnish or whatever. The potential problem with epoxy is that it dries
hard and can crack instead of flex.

Sorry I don't have the definitive answer.

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 >> Stay informed about: Epoxy okay on mahogany? 

Martin Schöön wrote:

 > On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:
 >
  > > A while back i asked about if it is okay to put fibreglass below the
  > > waterline of my 28 foot mahogany lapstraked carver mariner.
  > > Overwhelmingly the response was NO.
  > >
  > > heres my next question,
  > > Would just using epoxy to coat all wood surfaces of the hull be okay?
  > > or does anyone see anything wrong with it? i need the quickest,
  > > easiest way to make this boat waterproof so i can get a month out of
  > > it this year at least. it has already been sanded down, just waiting
  > > for my next move.
  > >

-------------------------------

Use a flexible epoxy paint and not the clear brittle epoxies used for
laminating and repairing etc. That will seal and waterproof but still allow
all kinds of movement of the wood as the uncoated sections expand,
contract, swell, etc. Such epoxies are generally pigmented so you could
paint and be back in the water in 24 hours or so. Come fall paint over the
'epoxy primer' with whatever you like.

I'm just finishing up the restoration of a rotting 1/4 inch plywood dinghy
in this manner - Even with epoxy inside and out, the plywood still has the
flex it originally did (in the non rotted or repaired spots - cleaning the
boat with a modest water blaster literally shot a 5 inch by 5 inch hole in
the bottom and a few smaller holes too!)


paul oman
progressive epoxy polymers


"Living on Earth is expensive, but it does include
a free trip around the Sun every year."
---------------<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

P.C. Ford (cwservices2@qwest.net) writes:

 > Are you sure the boat will not tighten up in the water? Most will.
 > Water sprayed inside the boat will hurry things along.

I think the boat under discussion is plywood lapstrake. I realize the
builder of such a boat should be branded and put in stocks in the town
square but I'm not sure that plywood will swell up tight like honest to
goodness real wood. I could be wrong.



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warning: non-FreeNet email must have "notspam" in subject or it's returned<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

You know where we can find this flexible epoxy paint? i live in
Ontario.

Does the epoxy paint seal the seams where two planks overlap as well?
or do i have to caulk with silicone stuff as well?
please reply, im itchin to get on the water.
thanks
-Jay


 >
 >Use a flexible epoxy paint and not the clear brittle epoxies used for
 >laminating and repairing etc. That will seal and waterproof but still allow
 >all kinds of movement of the wood as the uncoated sections expand,
 >contract, swell, etc. Such epoxies are generally pigmented so you could
 >paint and be back in the water in 24 hours or so. Come fall paint over the
 >'epoxy primer' with whatever you like.
 >
 >I'm just finishing up the restoration of a rotting 1/4 inch plywood dinghy
 >in this manner - Even with epoxy inside and out, the plywood still has the
 >flex it originally did (in the non rotted or repaired spots - cleaning the
 >boat with a modest water blaster literally shot a 5 inch by 5 inch hole in
 >the bottom and a few smaller holes too!)
 >
 >
 >paul oman
 >progressive epoxy polymers
 >
 >
 > "Living on Earth is expensive, but it does include
 > a free trip around the Sun every year."
 >---------------<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

Jason (greeky@rogers.com) writes:

 > or do i have to caulk with silicone stuff as well?

I've been advised not to use silicone on wooden boats because nothing else
will stick to it. For example, if the silicone doesn't do the job nothing
else will stick to the wood thereafter.

--
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William R Watt National Capital FreeNet Ottawa's free community network
homepage: <a style='text-decoration: underline;' href="http://www.ncf.ca/~ag384/top.htm" target="_blank">www.ncf.ca/~ag384/top.htm</a>
warning: non-FreeNet email must have "notspam" in subject or it's returned<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

If you use silicon I don't think any paint will ever stick to it. I've
used sikaflex for seam sealing on aluminum aircraft floats and it
works very well. It'll be messy but lay a thin bead along the joint
then force it in with a plastic squeege and scrape off the excess.
You'd be able to paint the next day. I found 2 places in London Ont
that sell it.

 >You know where we can find this flexible epoxy paint? i live in
 >Ontario.
 >
 >Does the epoxy paint seal the seams where two planks overlap as well?
 >or do i have to caulk with silicone stuff as well?
 >please reply, im itchin to get on the water.
 >thanks
 >-Jay
 >
 >
  >>
  >>Use a flexible epoxy paint and not the clear brittle epoxies used for
  >>laminating and repairing etc. That will seal and waterproof but still allow
  >>all kinds of movement of the wood as the uncoated sections expand,
  >>contract, swell, etc. Such epoxies are generally pigmented so you could
  >>paint and be back in the water in 24 hours or so. Come fall paint over the
  >>'epoxy primer' with whatever you like.
  >>
  >>I'm just finishing up the restoration of a rotting 1/4 inch plywood dinghy
  >>in this manner - Even with epoxy inside and out, the plywood still has the
  >>flex it originally did (in the non rotted or repaired spots - cleaning the
  >>boat with a modest water blaster literally shot a 5 inch by 5 inch hole in
  >>the bottom and a few smaller holes too!)
  >>
  >>
  >>paul oman
  >>progressive epoxy polymers
  >>
  >>
  >> "Living on Earth is expensive, but it does include
  >> a free trip around the Sun every year."
  >>---------------
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:

 > A while back i asked about if it is okay to put fibreglass below the
 > waterline of my 28 foot mahogany lapstraked carver mariner.
 > Overwhelmingly the response was NO.
 >
 > heres my next question,
 > Would just using epoxy to coat all wood surfaces of the hull be okay?
 > or does anyone see anything wrong with it? i need the quickest,
 > easiest way to make this boat waterproof so i can get a month out of
 > it this year at least. it has already been sanded down, just waiting
 > for my next move.
 >
 > any help is appreciated.
 > thanks,
 > -Jason

I wouldn't normally think of epoxy as a waterproofing material, but I
don't know what kind of boat you have. Here is a quote from _The
Gougeon Brothers on Boat Construction_ (fourth edition)

"Most available plans for traditional small craft were drawn many
years before the development of modern resins. They rely on traditional
building techniques ... This sort of construction is not compatible
with our methods and, unfortunately, any attempt to blend old and new
will probably result in an unsuccessful hybrid." (p7)

The Gougeon brothers are the guys behind West System epoxy products.

So I would advise you to seal the boat in the same fashion (more or
less) in which it was designed to be sealed.

I do have a little experience with the aesthetics of applying epoxy to
wood. By itself, epoxy is a terrible varnish substitute. It looks great at
first, and it is relatively easy to get a nice glossy finish, but it
begins to go milky. It will do this very rapidly (in a few days) if it is
exposed to direct sunlight. Eventually, it will be kind of yellow and
almost opaque.

What you can do, however, is apply a few coats of epoxy first to get rapid
buildup and a nearly perfect finish with little or no sanding, then apply
a standard marine varnish afterwards. (You have to wet sand the epoxy
with very fine sandpaper prior to applying the varnish). I'm not sure how
this holds up over the course of decades, but it holds up pretty well for
interior jobs over the course of several years.

Practice on a piece of plywood before you do it on a piece you care about.
Also, some varnishes may attack the cured epoxy, so be sure to test the
exact combination before using it.

HTH

--Mac<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

Jumping in late in the conversation here, so forgive me if I'm off track.

I did manage to build a traditionally constructed boat (see
<a style='text-decoration: underline;' href="http://www.reelboats.com" target="_blank">http://www.reelboats.com</a> ) with epoxy encapsulation one time, but not sure
I'd recommend it. Especially if the boat you are working on will not be
completely disassembled. In my case, I had to cut, fit, and finish each and
every component and then epoxy encapsulate them individually, then assembled
the boat with the sealed pieces. In some parts, such as putting the bottom
on, I still had to resort to standard fasteners and good adhesive/caulk (3M
5200, Sikaflex 241) as appropriate. If I were to do a traditionally
constructed boat again, I'd stick to the original way of sealing ...else it
costs you about 3X to 4X the time and it's likely that you still can't get
it all right. Note that since epoxy is 99.99% waterproof that any moisture
in that gets in the wood will migrate through the wood but run into the
epoxy 'barrier' from the inside. Because of surface states (check your
chemistry book), the water or moisture tends to stay at that boundary and
can lead to rot. It's better to either completely encapsulate and then keep
it that way -OR- say to heck with epoxy and use the same 'sealing' technique
(primer, paint, caulks etc) everywhere.

Given the above caveats, if you are only trying to get one month out of it,
then I guess you can pretty much do what you want ...waterproof with a good
coat of Grey Poupon Dijon if you want (grinz). On a more serious note, you
can expect that each coat of epoxy is equivalent to about 3 coats of varnish
for thickness. If encapsulating on a bright finished boat as described
above, rather than coating the boat with 10- 12 coats of varnish, you can
get away with about 3 coats of epoxy (do not do less than that) and finish
with 4 coats of a good quality UV inhibitive varnish such as Epifanes or
Z-Spar Captains. 4 coats of varnish is a bit on the thin side but will get
you through the first year. You should follow with coating more varnish on
each year for the first 2 to 4 years before you relax. After that, you can
expect 4 to 6 years (depending on sun exposure) between recoatings ...much
better than the annual sanding and coating that varnish-only boats require.

Brian D


"Mac" <foo.RemoveThis@bar.net> wrote in message
news:pan.2004.08.20.04.11.05.386829@bar.net...
 > On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:
 >
  > > A while back i asked about if it is okay to put fibreglass below the
  > > waterline of my 28 foot mahogany lapstraked carver mariner.
  > > Overwhelmingly the response was NO.
  > >
  > > heres my next question,
  > > Would just using epoxy to coat all wood surfaces of the hull be okay?
  > > or does anyone see anything wrong with it? i need the quickest,
  > > easiest way to make this boat waterproof so i can get a month out of
  > > it this year at least. it has already been sanded down, just waiting
  > > for my next move.
  > >
  > > any help is appreciated.
  > > thanks,
  > > -Jason
 >
 > I wouldn't normally think of epoxy as a waterproofing material, but I
 > don't know what kind of boat you have. Here is a quote from _The
 > Gougeon Brothers on Boat Construction_ (fourth edition)
 >
 > "Most available plans for traditional small craft were drawn many
 > years before the development of modern resins. They rely on traditional
 > building techniques ... This sort of construction is not compatible
 > with our methods and, unfortunately, any attempt to blend old and new
 > will probably result in an unsuccessful hybrid." (p7)
 >
 > The Gougeon brothers are the guys behind West System epoxy products.
 >
 > So I would advise you to seal the boat in the same fashion (more or
 > less) in which it was designed to be sealed.
 >
 > I do have a little experience with the aesthetics of applying epoxy to
 > wood. By itself, epoxy is a terrible varnish substitute. It looks great at
 > first, and it is relatively easy to get a nice glossy finish, but it
 > begins to go milky. It will do this very rapidly (in a few days) if it is
 > exposed to direct sunlight. Eventually, it will be kind of yellow and
 > almost opaque.
 >
 > What you can do, however, is apply a few coats of epoxy first to get rapid
 > buildup and a nearly perfect finish with little or no sanding, then apply
 > a standard marine varnish afterwards. (You have to wet sand the epoxy
 > with very fine sandpaper prior to applying the varnish). I'm not sure how
 > this holds up over the course of decades, but it holds up pretty well for
 > interior jobs over the course of several years.
 >
 > Practice on a piece of plywood before you do it on a piece you care about.
 > Also, some varnishes may attack the cured epoxy, so be sure to test the
 > exact combination before using it.
 >
 > HTH
 >
 > --Mac
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

I wonder if anyone of you have used Nyalic yet on wood instead of varnish..
It is UV proof cystal clear waterproof, nylonic coating. It is expensive.
Someday I will buy some.

"Brian D" <bogus.RemoveThis@bogus.net> wrote in message
news:OWhVc.157060$8_6.56861@attbi_s04...
 >
 > Jumping in late in the conversation here, so forgive me if I'm off track.
 >
 > I did manage to build a traditionally constructed boat (see
 > <a style='text-decoration: underline;' href="http://www.reelboats.com" target="_blank">http://www.reelboats.com</a> ) with epoxy encapsulation one time, but not sure
 > I'd recommend it. Especially if the boat you are working on will not be
 > completely disassembled. In my case, I had to cut, fit, and finish each
and
 > every component and then epoxy encapsulate them individually, then
assembled
 > the boat with the sealed pieces. In some parts, such as putting the
bottom
 > on, I still had to resort to standard fasteners and good adhesive/caulk
(3M
 > 5200, Sikaflex 241) as appropriate. If I were to do a traditionally
 > constructed boat again, I'd stick to the original way of sealing ...else
it
 > costs you about 3X to 4X the time and it's likely that you still can't get
 > it all right. Note that since epoxy is 99.99% waterproof that any
moisture
 > in that gets in the wood will migrate through the wood but run into the
 > epoxy 'barrier' from the inside. Because of surface states (check your
 > chemistry book), the water or moisture tends to stay at that boundary and
 > can lead to rot. It's better to either completely encapsulate and then
keep
 > it that way -OR- say to heck with epoxy and use the same 'sealing'
technique
 > (primer, paint, caulks etc) everywhere.
 >
 > Given the above caveats, if you are only trying to get one month out of
it,
 > then I guess you can pretty much do what you want ...waterproof with a
good
 > coat of Grey Poupon Dijon if you want (grinz). On a more serious note,
you
 > can expect that each coat of epoxy is equivalent to about 3 coats of
varnish
 > for thickness. If encapsulating on a bright finished boat as described
 > above, rather than coating the boat with 10- 12 coats of varnish, you can
 > get away with about 3 coats of epoxy (do not do less than that) and finish
 > with 4 coats of a good quality UV inhibitive varnish such as Epifanes or
 > Z-Spar Captains. 4 coats of varnish is a bit on the thin side but will
get
 > you through the first year. You should follow with coating more varnish
on
 > each year for the first 2 to 4 years before you relax. After that, you
can
 > expect 4 to 6 years (depending on sun exposure) between recoatings ...much
 > better than the annual sanding and coating that varnish-only boats
require.
 >
 > Brian D
 >
 >
 > "Mac" <foo.RemoveThis@bar.net> wrote in message
 > news:pan.2004.08.20.04.11.05.386829@bar.net...
  > > On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:
  > >
   > > > A while back i asked about if it is okay to put fibreglass below the
   > > > waterline of my 28 foot mahogany lapstraked carver mariner.
   > > > Overwhelmingly the response was NO.
   > > >
   > > > heres my next question,
   > > > Would just using epoxy to coat all wood surfaces of the hull be okay?
   > > > or does anyone see anything wrong with it? i need the quickest,
   > > > easiest way to make this boat waterproof so i can get a month out of
   > > > it this year at least. it has already been sanded down, just waiting
   > > > for my next move.
   > > >
   > > > any help is appreciated.
   > > > thanks,
   > > > -Jason
  > >
  > > I wouldn't normally think of epoxy as a waterproofing material, but I
  > > don't know what kind of boat you have. Here is a quote from _The
  > > Gougeon Brothers on Boat Construction_ (fourth edition)
  > >
  > > "Most available plans for traditional small craft were drawn many
  > > years before the development of modern resins. They rely on traditional
  > > building techniques ... This sort of construction is not compatible
  > > with our methods and, unfortunately, any attempt to blend old and new
  > > will probably result in an unsuccessful hybrid." (p7)
  > >
  > > The Gougeon brothers are the guys behind West System epoxy products.
  > >
  > > So I would advise you to seal the boat in the same fashion (more or
  > > less) in which it was designed to be sealed.
  > >
  > > I do have a little experience with the aesthetics of applying epoxy to
  > > wood. By itself, epoxy is a terrible varnish substitute. It looks great
at
  > > first, and it is relatively easy to get a nice glossy finish, but it
  > > begins to go milky. It will do this very rapidly (in a few days) if it
is
  > > exposed to direct sunlight. Eventually, it will be kind of yellow and
  > > almost opaque.
  > >
  > > What you can do, however, is apply a few coats of epoxy first to get
rapid
  > > buildup and a nearly perfect finish with little or no sanding, then
apply
  > > a standard marine varnish afterwards. (You have to wet sand the epoxy
  > > with very fine sandpaper prior to applying the varnish). I'm not sure
how
  > > this holds up over the course of decades, but it holds up pretty well
for
  > > interior jobs over the course of several years.
  > >
  > > Practice on a piece of plywood before you do it on a piece you care
about.
  > > Also, some varnishes may attack the cured epoxy, so be sure to test the
  > > exact combination before using it.
  > >
  > > HTH
  > >
  > > --Mac
  > >
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

One thing nice about marine varnish is that it can be stripped. Some of the
good coatings out there that would replace varnish are unstrippable plastics
....is this Nyalic stuff strippable? What's it like for repair later on?

Brian D


"scott downey" <sdowney.RemoveThis@access4less.net> wrote in message
news:2ps2k1Fp1126U1@uni-berlin.de...
 > I wonder if anyone of you have used Nyalic yet on wood instead of
varnish..
 > It is UV proof cystal clear waterproof, nylonic coating. It is expensive.
 > Someday I will buy some.
 >
 > "Brian D" <bogus.RemoveThis@bogus.net> wrote in message
 > news:OWhVc.157060$8_6.56861@attbi_s04...
  > >
  > > Jumping in late in the conversation here, so forgive me if I'm off
track.
  > >
  > > I did manage to build a traditionally constructed boat (see
  > > <a style='text-decoration: underline;' href="http://www.reelboats.com" target="_blank">http://www.reelboats.com</a> ) with epoxy encapsulation one time, but not
sure
  > > I'd recommend it. Especially if the boat you are working on will not be
  > > completely disassembled. In my case, I had to cut, fit, and finish each
 > and
  > > every component and then epoxy encapsulate them individually, then
 > assembled
  > > the boat with the sealed pieces. In some parts, such as putting the
 > bottom
  > > on, I still had to resort to standard fasteners and good adhesive/caulk
 > (3M
  > > 5200, Sikaflex 241) as appropriate. If I were to do a traditionally
  > > constructed boat again, I'd stick to the original way of sealing ...else
 > it
  > > costs you about 3X to 4X the time and it's likely that you still can't
get
  > > it all right. Note that since epoxy is 99.99% waterproof that any
 > moisture
  > > in that gets in the wood will migrate through the wood but run into the
  > > epoxy 'barrier' from the inside. Because of surface states (check your
  > > chemistry book), the water or moisture tends to stay at that boundary
and
  > > can lead to rot. It's better to either completely encapsulate and then
 > keep
  > > it that way -OR- say to heck with epoxy and use the same 'sealing'
 > technique
  > > (primer, paint, caulks etc) everywhere.
  > >
  > > Given the above caveats, if you are only trying to get one month out of
 > it,
  > > then I guess you can pretty much do what you want ...waterproof with a
 > good
  > > coat of Grey Poupon Dijon if you want (grinz). On a more serious note,
 > you
  > > can expect that each coat of epoxy is equivalent to about 3 coats of
 > varnish
  > > for thickness. If encapsulating on a bright finished boat as described
  > > above, rather than coating the boat with 10- 12 coats of varnish, you
can
  > > get away with about 3 coats of epoxy (do not do less than that) and
finish
  > > with 4 coats of a good quality UV inhibitive varnish such as Epifanes or
  > > Z-Spar Captains. 4 coats of varnish is a bit on the thin side but will
 > get
  > > you through the first year. You should follow with coating more varnish
 > on
  > > each year for the first 2 to 4 years before you relax. After that, you
 > can
  > > expect 4 to 6 years (depending on sun exposure) between recoatings
....much
  > > better than the annual sanding and coating that varnish-only boats
 > require.
  > >
  > > Brian D
  > >
  > >
  > > "Mac" <foo.RemoveThis@bar.net> wrote in message
  > > news:pan.2004.08.20.04.11.05.386829@bar.net...
   > > > On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:
   > > >
   > > > > A while back i asked about if it is okay to put fibreglass below the
   > > > > waterline of my 28 foot mahogany lapstraked carver mariner.
   > > > > Overwhelmingly the response was NO.
   > > > >
   > > > > heres my next question,
   > > > > Would just using epoxy to coat all wood surfaces of the hull be
okay?
   > > > > or does anyone see anything wrong with it? i need the quickest,
   > > > > easiest way to make this boat waterproof so i can get a month out of
   > > > > it this year at least. it has already been sanded down, just
waiting
   > > > > for my next move.
   > > > >
   > > > > any help is appreciated.
   > > > > thanks,
   > > > > -Jason
   > > >
   > > > I wouldn't normally think of epoxy as a waterproofing material, but I
   > > > don't know what kind of boat you have. Here is a quote from _The
   > > > Gougeon Brothers on Boat Construction_ (fourth edition)
   > > >
   > > > "Most available plans for traditional small craft were drawn many
   > > > years before the development of modern resins. They rely on
traditional
   > > > building techniques ... This sort of construction is not compatible
   > > > with our methods and, unfortunately, any attempt to blend old and new
   > > > will probably result in an unsuccessful hybrid." (p7)
   > > >
   > > > The Gougeon brothers are the guys behind West System epoxy products.
   > > >
   > > > So I would advise you to seal the boat in the same fashion (more or
   > > > less) in which it was designed to be sealed.
   > > >
   > > > I do have a little experience with the aesthetics of applying epoxy to
   > > > wood. By itself, epoxy is a terrible varnish substitute. It looks
great
 > at
   > > > first, and it is relatively easy to get a nice glossy finish, but it
   > > > begins to go milky. It will do this very rapidly (in a few days) if it
 > is
   > > > exposed to direct sunlight. Eventually, it will be kind of yellow and
   > > > almost opaque.
   > > >
   > > > What you can do, however, is apply a few coats of epoxy first to get
 > rapid
   > > > buildup and a nearly perfect finish with little or no sanding, then
 > apply
   > > > a standard marine varnish afterwards. (You have to wet sand the epoxy
   > > > with very fine sandpaper prior to applying the varnish). I'm not sure
 > how
   > > > this holds up over the course of decades, but it holds up pretty well
 > for
   > > > interior jobs over the course of several years.
   > > >
   > > > Practice on a piece of plywood before you do it on a piece you care
 > about.
   > > > Also, some varnishes may attack the cured epoxy, so be sure to test
the
   > > > exact combination before using it.
   > > >
   > > > HTH
   > > >
   > > > --Mac
   > > >
  > >
  > >
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany? 

It does have a solvent and new coats melt into the old.


"Brian D" <bogus.DeleteThis@bogus.net> wrote in message
news:89K_c.135270$mD.91951@attbi_s02...
 >
 > One thing nice about marine varnish is that it can be stripped. Some of
the
 > good coatings out there that would replace varnish are unstrippable
plastics
 > ...is this Nyalic stuff strippable? What's it like for repair later on?
 >
 > Brian D
 >
 >
 > "scott downey" <sdowney.DeleteThis@access4less.net> wrote in message
 > news:2ps2k1Fp1126U1@uni-berlin.de...
  > > I wonder if anyone of you have used Nyalic yet on wood instead of
 > varnish..
  > > It is UV proof cystal clear waterproof, nylonic coating. It is
expensive.
  > > Someday I will buy some.
  > >
  > > "Brian D" <bogus.DeleteThis@bogus.net> wrote in message
  > > news:OWhVc.157060$8_6.56861@attbi_s04...
   > > >
   > > > Jumping in late in the conversation here, so forgive me if I'm off
 > track.
   > > >
   > > > I did manage to build a traditionally constructed boat (see
   > > > <a style='text-decoration: underline;' href="http://www.reelboats.com" target="_blank">http://www.reelboats.com</a> ) with epoxy encapsulation one time, but not
 > sure
   > > > I'd recommend it. Especially if the boat you are working on will not
be
   > > > completely disassembled. In my case, I had to cut, fit, and finish
each
  > > and
   > > > every component and then epoxy encapsulate them individually, then
  > > assembled
   > > > the boat with the sealed pieces. In some parts, such as putting the
  > > bottom
   > > > on, I still had to resort to standard fasteners and good
adhesive/caulk
  > > (3M
   > > > 5200, Sikaflex 241) as appropriate. If I were to do a traditionally
   > > > constructed boat again, I'd stick to the original way of sealing
....else
  > > it
   > > > costs you about 3X to 4X the time and it's likely that you still can't
 > get
   > > > it all right. Note that since epoxy is 99.99% waterproof that any
  > > moisture
   > > > in that gets in the wood will migrate through the wood but run into
the
   > > > epoxy 'barrier' from the inside. Because of surface states (check
your
   > > > chemistry book), the water or moisture tends to stay at that boundary
 > and
   > > > can lead to rot. It's better to either completely encapsulate and
then
  > > keep
   > > > it that way -OR- say to heck with epoxy and use the same 'sealing'
  > > technique
   > > > (primer, paint, caulks etc) everywhere.
   > > >
   > > > Given the above caveats, if you are only trying to get one month out
of
  > > it,
   > > > then I guess you can pretty much do what you want ...waterproof with a
  > > good
   > > > coat of Grey Poupon Dijon if you want (grinz). On a more serious
note,
  > > you
   > > > can expect that each coat of epoxy is equivalent to about 3 coats of
  > > varnish
   > > > for thickness. If encapsulating on a bright finished boat as
described
   > > > above, rather than coating the boat with 10- 12 coats of varnish, you
 > can
   > > > get away with about 3 coats of epoxy (do not do less than that) and
 > finish
   > > > with 4 coats of a good quality UV inhibitive varnish such as Epifanes
or
   > > > Z-Spar Captains. 4 coats of varnish is a bit on the thin side but
will
  > > get
   > > > you through the first year. You should follow with coating more
varnish
  > > on
   > > > each year for the first 2 to 4 years before you relax. After that,
you
  > > can
   > > > expect 4 to 6 years (depending on sun exposure) between recoatings
 > ...much
   > > > better than the annual sanding and coating that varnish-only boats
  > > require.
   > > >
   > > > Brian D
   > > >
   > > >
   > > > "Mac" <foo.DeleteThis@bar.net> wrote in message
   > > > news:pan.2004.08.20.04.11.05.386829@bar.net...
   > > > > On Tue, 27 Jul 2004 02:58:19 +0000, Jason wrote:
   > > > >
   > > > > > A while back i asked about if it is okay to put fibreglass below
the
   > > > > > waterline of my 28 foot mahogany lapstraked carver mariner.
   > > > > > Overwhelmingly the response was NO.
   > > > > >
   > > > > > heres my next question,
   > > > > > Would just using epoxy to coat all wood surfaces of the hull be
 > okay?
   > > > > > or does anyone see anything wrong with it? i need the quickest,
   > > > > > easiest way to make this boat waterproof so i can get a month out
of
   > > > > > it this year at least. it has already been sanded down, just
 > waiting
   > > > > > for my next move.
   > > > > >
   > > > > > any help is appreciated.
   > > > > > thanks,
   > > > > > -Jason
   > > > >
   > > > > I wouldn't normally think of epoxy as a waterproofing material, but
I
   > > > > don't know what kind of boat you have. Here is a quote from _The
   > > > > Gougeon Brothers on Boat Construction_ (fourth edition)
   > > > >
   > > > > "Most available plans for traditional small craft were drawn many
   > > > > years before the development of modern resins. They rely on
 > traditional
   > > > > building techniques ... This sort of construction is not compatible
   > > > > with our methods and, unfortunately, any attempt to blend old and
new
   > > > > will probably result in an unsuccessful hybrid." (p7)
   > > > >
   > > > > The Gougeon brothers are the guys behind West System epoxy products.
   > > > >
   > > > > So I would advise you to seal the boat in the same fashion (more or
   > > > > less) in which it was designed to be sealed.
   > > > >
   > > > > I do have a little experience with the aesthetics of applying epoxy
to
   > > > > wood. By itself, epoxy is a terrible varnish substitute. It looks
 > great
  > > at
   > > > > first, and it is relatively easy to get a nice glossy finish, but it
   > > > > begins to go milky. It will do this very rapidly (in a few days) if
it
  > > is
   > > > > exposed to direct sunlight. Eventually, it will be kind of yellow
and
   > > > > almost opaque.
   > > > >
   > > > > What you can do, however, is apply a few coats of epoxy first to get
  > > rapid
   > > > > buildup and a nearly perfect finish with little or no sanding, then
  > > apply
   > > > > a standard marine varnish afterwards. (You have to wet sand the
epoxy
   > > > > with very fine sandpaper prior to applying the varnish). I'm not
sure
  > > how
   > > > > this holds up over the course of decades, but it holds up pretty
well
  > > for
   > > > > interior jobs over the course of several years.
   > > > >
   > > > > Practice on a piece of plywood before you do it on a piece you care
  > > about.
   > > > > Also, some varnishes may attack the cured epoxy, so be sure to test
 > the
   > > > > exact combination before using it.
   > > > >
   > > > > HTH
   > > > >
   > > > > --Mac
   > > > >
   > > >
   > > >
  > >
  > >
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Epoxy okay on mahogany?