All foam in one way or another will "soak" in water if exposed for extended periods of time. When looking for replacement foam make sure that your get "closed cell". Typically it is like a two part mix that expands when mixed together. But ClOSED CELL is the key. I poured new foam under the rotten floor of and old tri hull and it worked great. It was so good it firmed up all the runners so all I had to do was put new wood down on top vs replacing all the runners and the top floor. I only had it about five years after that and never once had the "wet sponge" effect with it.


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