I got the two part pour foam delivered yesterday so today I experimented with it. This stuff is pretty cool. I poured the 3 small enclosed areas in the front of the boat in 3 seperate pours. I figured each of the areas was 1 cubic foot, mixed 1 pint part A and 1 pint part B, poured it in and within 2 minutes it had risen, like bread dough, and filled entire space. I poured another 2 cubic feet in the nose under the front casting deck. At 65 pounds per cubic foot, I added about 325 pounds of buoyancy. It got a little high in one spot but after it hardened, maybe 5 minutes, I trimmed it down with a hand saw. Hopefully I can get it in the water tomorrow to check for leaks, then pour the rest of the floor.