This is an answer I got from a boat seller, is it true?
He also says that he thinks his boat is Epoxy! The boat is a 40' 1983 Glass over wood Custom Trimaran.
Maintaining glass/plywood boats - simple...KEEP THE RAINWATER OUT! Salwater will not rot wood. Rainwater seeping thru inproperly bedded deck hardware can cause problems if not detected and cured. I've owned so called 'fiberglass' boats with plywood deck cores and the problem is the same. After a period of rain inspect the fasteners below decks, check for water drops....if found, remove and rebed the fitting. I use exclusively 3M 5200 for bedding compound...is is very difficult to remove but is the longest lasting. Today Three Angels has no deck leaks. Can't guarantee about tomorrow, tho.