Re: glassing questions
Glass will stick to marine grade plywood, you may have troubles over pressure treated wood if it hasn't been allowed a chance to thoroughly dry out the pressure treat chemicals. Any exterior grade plywood will work fine, the advantage of marine grade is the multitude of layers and lack of voids within the layers. The more layers, the stiffer the plywood is, and the glues used are water resistant, so the laminate won't peel apart if the wood does get wet for some reason. You can seal the wood and then glass it afterwards. Some prefer to seal with the same product they are glassing with ( thinned polyester or thinned epoxy resins )
the idea is simply to block water intrusion when it eventually gets to the wood. Any place water can potentially penetrate the wood fiber is the first place it's going to rot and it won't stop if it's allowed to "dry" if the wood is fully encapsulated in resin/glass, which is why it's important to seal all your screw holes.
Delorean thought they were going to be smart by epoxy dipping their steel chassis during production, so that their rust free Stainless Steel car wouldn't rust anywhere there wasn't SS. Problem was, chassis flex caused the epoxy to crack from stress over time, water gets in, has no where to go...rusts out the frame. Great concept, bad application.
