I have a 1981 SeaRay SRV210 Cuddy, which I've started recondition the
interior on. Upon pulling up the old carpet, I found the floor on the port
side soft and spongy. This boat has a fuel tank mounted in center of the
hull under the floor that runs from the step-down into the cuddy back to the
engine compartment. There is a foam filled cavity on each side of the fuel
tank which is covered with plywood and glassed in place.

Only one of the cavities showed any signs of delamination of the floor. I
now have the glass and plywood tore off the one cavity from the cuddy area
back to the transom. Before removing the glass and plywood, I noticed a
pattern of holes (approx. 3/4 inch) drilled through the glass and plywood,
the foam was level with the top of the glass. I have to assume that when
foam was put in, it was poured or injected through these holes and as the
foam expanded the excess foam was able to exit these holes.

Now, I have the water saturated foam dug out of the cavity and letting every
thing dry out before sealing it back up.

I would like to put the new plywood floor in place glass it in solid, then
drill the same pattern of holes, and pour in new foam. It seems to me that
the foam up expand up to the bottom of the floor and provide a solid floor.

A local vendor who sells the foam suggested leaving the top off the cavity,
filling it with the foam, cut the excess off, and then install the top. I
just don't think I would get a solid floor doing it this way.

Sorry for the long post, but I've never worked with 2 part foam before and
I'm curious if someone out there can share any experiences with me.

Thanks in advance