i used to run the foam department for 1/2 million $ sport fishers. the trick is to keep the foam resins around 72 degrees for as long as you can,( store and mix if you can) the cold and speed buy time to flow before the rise, power mix like hell, and pour fast. there are some that snear at cutting closed cell foam, but the way you resealed seamed effective. great job man.n
Good video, but I was hoping to get an idea of how much it expands, to determine if it's worth my while for a different project. I would have loved to see an after photo of that first test section!
Polyurethane foam is closed cell and water proof, when you sand it you open the cells but majority os water tight. I foamed filled to provide buoyancy if I punctured the hull and the sound proofing makes for a very nice day on the water. Cheers