Capt Chuck,
I believe the foam from Jo Ann's Fabric is open cell.
Yes you are correct it will act like a sponge.
It's not the best stuff to use in a marine environment.
However I cannot find the close cell foam at a reasonable price.
When using the open cell foam I use a waterproof vinyl to cover. I also use seam stick on all my seams and put the zipper inside a folded pocket to keep water intrusion to a minimum. Still not the best but again the $$$ is a big difference.
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Regards Barry
1987 V20 (sold) :(
1996 23' Wellcraft
1991 V20 ;)
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