Also I'm not big on marine grade plywood if it is still pine. Marine
grade just means it has no voids. That's pretty important for a
transom or hull but doesn't matter as much for a floor. Given the
choice between a better wood such as fir and marine grade pine ply I
would go with the fir. Pine just rots so easily when it gets wet.
Some people advocate pressure treated but it is difficult to get
anything to bond properly to pressure treated ply.

jamesgangnc wrote:
There are a number of opinions on that topic. One thing I think
everyone will agree on is that epoxy is better than polyester resin. I
find pretty good deals on epoxy at http://www.uscomposites.com/

c0d3phr3ak wrote:
I have ripped out the floor out of my boat as it was pretty rotted.
Replacing it with plywood is not an issue, should I cover the whole
peice of plywood in fibreglass to stop it from rotting again, or is
there a paint/stain/sealer I can paint the wood with before I carpet it
that would be better and less expensive?

Thanks!
J