Thanks for that link. I'll try some out in the spring when I start working on her! I have laminated all the previous plywood that I replaced already. I did not find the cabin damage until one day last summer we were floating out on the Niagara and I needed something out of my cabin center storage locker. I discovered water seeping in through the floor of the compartment. In unison with the waves hitting the sides of the boat. I showed my son and we were mortified!! A few weeks later after I drilled holes into the floor to try to drain the water out, I found it was running down from topside from the anchor locker. Boy, was I relived to know it wasn't coming in from the hull! LOL. But the damage has been done. Need new floors, compartment sides and A couple of cross members in the cabin. "OH WELL"If the floors are plywood, all the water enters from the edges. There's nothing wrong w/plywood, the edges just need to be sealed. System Three Epoxy ( http://www.systemthree.com/index_2.asp ) has a very thin penetrating epoxy that I use to seal all the edges on plywood, and all the end grain on boards etc. If done properly, the pieces will never rot. The same thing applies to holes through the deck coring. I would probably remove any foam unless it's required by the USCG in your case.
Sam.