Im not a fan of the foam. Its a PITA if you have to run wires, or anything else under there. If you have a problem down the road, you can't access anything, and it stops the water from flowing out of your bilge. I used the pour in foam last time in parts of my boat, and its not supposed to absorb water either, but it has 100%, and now its a PITA to remove lol......I'm using Foam board. Easy in, easy out, and doens't absorb (as much) water.
S.