foam flotation in a boat

[alg]

I'm replacing the floor on my boat, and need to replace some of the flotation. Can I use the foam that comes in a can, and just foam it in?

[Outfitter17]

Thats what I am planning on doing this fall to a couple of my boats.

[BradT]

I used the foam in a can in my '65 duracraft when I redid the floor, worked great, can get messy though. much better than the crumped styrofoam that was in there. If I did it again I'd use the white foam that stays soft the yellow foam gets very hard and can expand too much and lift the floor if your not careful. and clean up any mess right away, if you let the yellow foam harden it can get like concrete and get hard to remove.

[alg]

Since I asked the question I was told not to use something like "Great Stuff" because it retains water. Anyone hear that? If it does, what should I use?

[walleyeseeker]

You used to be able to get a floatation type foam from marine dealers. From what I can remember, you mixed a base with some type of catalyst in a cup and poured it in place and watched it rise. Hope this helps. And yes, Great Stuff will hold water. You need a closed cell foam.

[sparcebag]

Even with closed cell foam do a gas test & oil some will melt in contact