Boy this thread is getting a bit nasty. Calm down guys!

One more point I want to make that might help cool things down a bit.....

wood expands and contracts with moisture

things like epoxy, fiberglass, paint, and just about all other things,
expand and contract with temperature.
So - wood and the epoxy on it don't expand and contract together...
This can cause some of the issues brought up here. Always best to
complete seal the wood with epoxy, not just one side. Also, plywood,
because of the way it is made etc. expands and contracts very little (at
least compared to 'regular' wood).


Also epoxies stick really well to most materials and is often considered
sort of a universal primer.

polyester resin (fiberglass resin) doesn't bond well (or long) to
anything but itself (I and my customers report polyester resin to wood
bond failures after a few years maybe 10 years at best). This is why
fiberglass boats are generally 100% fiberglass and not half fiberglass
and half wood (as might/could be the case with epoxy resin). So.... you
can repair fiberglass with epoxy but fixing epoxy with fiberglass resin
in not recommend (but many folks do and they get away with it).

Epoxy resins just have all around better physical properties than
polyester resin, but usually cost more.

I vaguely recall seeing water absorption numbers for epoxy at something
like 1/10 of a percent. Don't ask me where or how I got that number,
just something that is floating adrift in my head.


cheers everyone

paul oman
progressive epoxy polymers






Lodewijk Stegman wrote:

schreef in
oups.com



On Jul 11, 4:21 pm, Lodewijk Stegman
wrote:





I'm sorry to say, but you ARE wrong. It is almost impossible to use
epoxy and wood together without depending on the waterproof qualities
of epoxy. I wonder what you have used it for and how you engineer
your work if you're so sure it leaks.



Have a great day and go build a boat!


Sure. You go build a heavy wooden boat. But don't use epoxy. You're
not knowledgeable enough.





You don't know what you don't know. You certainly know nothing about
me and my experience. Next time however it would help if your read my
post and Pauls (epoxy expert, retailer) post for content, instead of
just trying to feed your ego with ignorant insults. Later kid...



There's not all that much content in your post.

Maybe you should point out your experiences and your engineering.
I meant what I said when I stated that it's almost impossible to use wood
and epoxy together if you don't rely on it's waterproof qualities.

For instance: wood shrinks and swells with changing humidity. Epoxy won't
move with it. How do you engineer that?