repairing a fiberglass canoe

Toller wrote:

> A fiberglass canoe washed up on a friends beach a couple years ago. He
> tossed it over to one side. Since no one has claimed it, I think repairing
> it will make a good project for my son this summer. He is actually eager to
> do it.
>
> It has two holes, one in the bow and one in the stern. It looks like
> someone dragged it over a driveway and simply ground holes. The previous
> owner patched it with what seems to be asphaltic tape. He also painted the
> inside and outside.
>
> I am planning on putting one layer of fiberglass over the holes, and then a
> larger layer over the entire bottom. The construction is awfully flimsy and
> can use some strengthening.
>
> First thing is to get the paint off. I have tried simply scraping and that
> gets a little off. A heat gun and scraping gets most of it off, but not
> all. And I am not not sure how good a heat gun is for fiberglass.
> I don't want to sand (except of course where I will be putting new
> fiberglass) because the fiberglass is so thin, and I have doubts about the
> safety of a chemical stripper on fiberglass; someone warned me it will
> soften the resin.
>
> So, any suggestions?
>
>
It sounds like a great father/son project. You don't mention the
make/model of the canoe. I would check and confirm the construction
materials. Expoxy resin and polyester resins will not bond well
togehter so if the canoe is fiberglass, you should know which resin was
used. If it is a fiberglass canoe, it may have a balsa core between
layers - check for water wicking/damage.

Is it possible that the canoe is actually made out of ABS or
polyethylene instead of fiberglass? You said it was flimsy construction
- ABS feels very flimsy and "rubbery" in a sense. ABS and poly can only
be repaired with special materials, but it probably can be done.

Assuming fiberglass, if it were me, I'd make the spot repairs, feather
them in, and sand the old paint down with 80 grit as another poster
suggested, then smooth sand and prime/paint the boat with a good marine
paint. I would not add another layer of fiberglass which will add
weight and not much structure.

You don't mention your son's age but sanding, feathering, painting, are
more likely within his skill sets than reglassing the whole hull.
Instead of more glass, I'd put that time into inwales, tharts, seats,
and appearance items.

Hope this helps - HH
 >> Stay informed about: repairing a fiberglass canoe 

On 2006-06-17 23:03:26 -0400, "H.Hatcher" <hatch DeleteThis @whatsit.net> said:

> It sounds like a great father/son project. You don't mention the
> make/model of the canoe. I would check and confirm the construction
> materials. Expoxy resin and polyester resins will not bond well
> togehter so if the canoe is fiberglass, you should know which resin was
> used. If it is a fiberglass canoe, it may have a balsa core between
> layers - check for water wicking/damage.

Two little points... No manufacturer of canoes that I've ever seen has
done a cored hull for their canoes. It just isn't cost-effective for
them, or even structurally necessary.

Second, epoxy does not have problem bonding to polyester or vinylester
resins, provided the surface is properly cleaned and sanded.

HH seems to be a fount of misinformation.
 >> Stay informed about: repairing a fiberglass canoe