Has anyone used this foam? I'm told it is a closed cell foam that comes in sheets or blocks. I also hear it is a bit spendy. But then again, so is pour in closed cell foam. The mix/pour race of pour in foam seems too frantic to me. I am thinking of buying Ethafoam and cutting it into the required sizes to fit between my stringers. Then lay down either Seacast self leveling floor or the 1/2 inch marine ply.<br /><br />Any experiances with this stuff from anyone?