It can be done with pourable foam Posted by: randy_morgart on Dec-27-12 10:40 AM (EST)
I bought a WW boat the had the nose poured full of foam instead of footpegs. I'm not sure if it has different composition than the spray foam. If you have a way to secure the foam you could line the space with a non reactive plastic then fill the plastic with foam making it removable. Something as simple as a couple cords embedded in the foam and going to a deck fitting could work to secure it. Good Luck Randy