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post #18 of Old 07-28-2008
SteveCox
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Join Date: Jul 2006
Location: Tacoma, WA
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Glassing wood boats

A couple of points to keep in mind here. Fiberglassing of PLANKED boats is always a bad idea. It's not the breathing I'm worried about, it's that the wood will move and the glass not as much which leads to cracks in the glass which lets in water which causes rot...and so on. Fibergalssing of PLYWOOD boats is not a bad idea becuse you don't have the wood movement issue which gives a greater possibility of the glass layer staying intact. The other thing to keep in mind is that it matters what resin is used. Polyester resin has lousy adhesion to wood, ply or otherwise, and will at some point delam causing all sorts of problems. Epoxy on the other hand has very good adhesion to wood which iswhat you're seeing with cold molded boats, strip planked kayaks, etc. My boat has plywood topsides and decks covered with glass and you can really tell what was done originally with polyester and what was repaired with epoxy. The poly layer just rips off the ply while the epoxy pretty much pulls the wood apart before it will come up.
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