[Destroyer]

Originally Posted by RABBITFISH

Yes here is the site where I got the foam from..http://www.uscomposites.com/foam.html
Great stuff, and it is the kind that does not absorb water..

Rabbitfish, I'm sorry to have to tell you, but ALL foam will eventually absorb water... Open cell, closed cell, it makes no difference. These forums are filled with posts from guys that opened their decks because of soft spots, only to find that their stringers and under deck wood had rotted away... and in the process found out that the foam in their bilges was saturated with hundreds and hundreds of pounds of water. If you go to most foam manufacturers websites you'll see disclaimers in the fine print stating that their foam is not recommended for continuous immersion in water. In fact, this quote is from the site you posted the link to:

This foam is approximately 95-98% closed cell which resists absorbing water, however continuous water submersion can eventually lead to loss of buoyancy over a period of years.

Now granted, it may take several years for the foam to start absorbing the water, but eventually all foam will. The ONLY cure to keep foam from absorbing water is to not let it get wet in the first place. Seal all deck hatches, fix all cracks and holes in rod racks, seal and cap all rod holders... in short, do all you can to keep water out of your hull. Your deck, stringers, transom, foam, tank and wallet will thank you for it in the long run.