Which type of resin for boat repair?

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 >> Stay informed about: Which type of resin for boat repair? 

<salty.RemoveThis@dog.com> wrote

> I thought polyester was for really cheap, tacky clothing?

That too.

Lew
 >> Stay informed about: Which type of resin for boat repair? 

"David Murray" <DavyMurray.DeleteThis@Hotmail.com> wrote in message
news:YoYFi.88335$xp6.86688@fe3.news.blueyonder.co.uk...
> Hi there.
> I have a small (14 foot) grp boat which needs some repair work done to the
> hull and cuddy.
> My question is which type of resin should I use for the repair - epoxy or
> polyester resin?
> I have a feeling epoxy is best for marine applications but just want to
> check.
Either is fine for fabrication, but polyester won't stick very well, so it
is not a good choice for repairs.
 >> Stay informed about: Which type of resin for boat repair? 

"David Murray" <DavyMurray RemoveThis @Hotmail.com> wrote in message
news:YoYFi.88335$xp6.86688@fe3.news.blueyonder.co.uk...
> Hi there.
> I have a small (14 foot) grp boat which needs some repair work done to the
> hull and cuddy.
> My question is which type of resin should I use for the repair - epoxy or
> polyester resin?
> I have a feeling epoxy is best for marine applications but just want to
> check.
> Please advise
> Thanks
> Davy M.
>
>
Check out http://www.westsystem.com/.
 >> Stay informed about: Which type of resin for boat repair? 

Thanks for your advise folks - I guess it's epoxy then.

Davy M.
 >> Stay informed about: Which type of resin for boat repair? 

On Sep 13, 3:16 pm, "David Murray" <DavyMur....DeleteThis@Hotmail.com> wrote:
> Thanks for your advise folks - I guess it's epoxy then.
>
> Davy M.

Yeah, and if you use any glass cloth, mat, etc, make sure it is for
use with Epoxy, not Poly, or Vynel, etc.
 >> Stay informed about: Which type of resin for boat repair? 

On Sep 12, 4:57 pm, "David Murray" <DavyMur... DeleteThis @Hotmail.com> wrote:
> Hi there.
> I have a small (14 foot) grp boat which needs some repair work done to the
> hull and cuddy.
> My question is which type of resin should I use for the repair - epoxy or
> polyester resin?
> I have a feeling epoxy is best for marine applications but just want to
> check.
> Please advise
> Thanks
> Davy M.

Polyester will do fine. I was looking at some 20-year old Abacores
this summer at a sailing club I used to belong to when the boats were
new. These are club boats used in training and racing so they get a
lot of abuse. The polyester repairs are all holding up fine.

Unless you buy epoxy in 55 gal drums and can get it cheap. In small
lots it's still pretty expensive. about twice the cost of polyester
around here. Or if you already have some epoxy on hand you want to use
up.

Polyester is more brittle and less adhesive but it's good on a ridgid
surface which is clean and pourous, which old sanded polyester is.

Epoxy is a great waterproof glue, and the cured resin is stronger and
more flexible than polyester. Also epoxy molecules are similar to the
cellualr structure of wood so it cures right into the wood for
excellent bonding.

Polyester is easier to mix and more forgiving. If you don't mix in
enough hardener you can mix up more and spread it on and the hardener
will migrate into the uncured resin. Epoxy has to be mixed right the
first time. Some people develop an allergy to the hardener used in
epoxy and have to stop using it. Epoxy can go on over polyester, but
polyester can't go on over epoxy, so once you switch to epoxy you
can't go back to polyester where you've made repairs.

Finally, most of what you read in this newsgoup about polyester is
boatbuilder myth perpetrated in the past by sellers of epoxy desperate
to find some excuse for people to buy the more expensive resin, and
when it first came on the market is was more expensive than it is now.
It was a hard sell as anything but a great strong waterproof
adhesive.

I only use epoxy when I have to, and use polyester wherever I can.
But I do not, nor have I ever, worn a polyester leisure suit. That's
just going too far.
 >> Stay informed about: Which type of resin for boat repair? 

Wm Watt wrote:
>
>
> Polyester will do fine. I was looking at some 20-year old Abacores
> this summer at a sailing club I used to belong to when the boats were
> new. These are club boats used in training and racing so they get a
> lot of abuse. The polyester repairs are all holding up fine.
>
> Unless you buy epoxy in 55 gal drums and can get it cheap. In small
> lots it's still pretty expensive. about twice the cost of polyester
> around here. Or if you already have some epoxy on hand you want to use
> up.
>
> Polyester is more brittle and less adhesive but it's good on a ridgid
> surface which is clean and pourous, which old sanded polyester is.
>
> Epoxy is a great waterproof glue, and the cured resin is stronger and
> more flexible than polyester. Also epoxy molecules are similar to the
> cellualr structure of wood so it cures right into the wood for
> excellent bonding.
>
> Polyester is easier to mix and more forgiving. If you don't mix in
> enough hardener you can mix up more and spread it on and the hardener
> will migrate into the uncured resin. Epoxy has to be mixed right the
> first time. Some people develop an allergy to the hardener used in
> epoxy and have to stop using it. Epoxy can go on over polyester, but
> polyester can't go on over epoxy, so once you switch to epoxy you
> can't go back to polyester where you've made repairs.
>
> Finally, most of what you read in this newsgoup about polyester is
> boatbuilder myth perpetrated in the past by sellers of epoxy desperate
> to find some excuse for people to buy the more expensive resin, and
> when it first came on the market is was more expensive than it is now.
> It was a hard sell as anything but a great strong waterproof
> adhesive.
>
> I only use epoxy when I have to, and use polyester wherever I can.
> But I do not, nor have I ever, worn a polyester leisure suit. That's
> just going too far.
>


For what it's worth, I strongly disagree about the merits of polyester
mentioned here.

Great for initial build, but getting a secondary bond of eny strength
at all is problematic.

Epoxy for ALL secondayr work.

My .02
For what it's worth/

Richard
 >> Stay informed about: Which type of resin for boat repair? 

This message is not archived
 >> Stay informed about: Which type of resin for boat repair? 

On Wed, 12 Sep 2007 20:57:28 GMT, "David Murray"
<DavyMurray.DeleteThis@Hotmail.com> wrote stuff
and I replied:
What sort of repair?

>Hi there.
>I have a small (14 foot) grp boat which needs some repair work done to the
>hull and cuddy.
>My question is which type of resin should I use for the repair - epoxy or
>polyester resin?
>I have a feeling epoxy is best for marine applications but just want to
>check.
>Please advise
>Thanks
>Davy M.
>

Human bevaviour: Bestiality with a brain
 >> Stay informed about: Which type of resin for boat repair? 

On Thu, 13 Sep 2007 21:24:02 -0000, justwaitafrekinminute.DeleteThis@gmail.com
wrote stuff
and I replied:

i sed that

>On Sep 13, 3:16 pm, "David Murray" <DavyMur....DeleteThis@Hotmail.com> wrote:
>> Thanks for your advise folks - I guess it's epoxy then.
>>
>> Davy M.
>
>Yeah, and if you use any glass cloth, mat, etc, make sure it is for
>use with Epoxy, not Poly, or Vynel, etc.

Human bevaviour: Bestiality with a brain
 >> Stay informed about: Which type of resin for boat repair?