Re: Buying Boat Foam
Cheapest I've found is a friend that builds insulated water tanks. Squirted my cavities full for free.
Seriously, one option is to find a small manufacturer that uses the stuff, and get him to squirt it in. With the machine mixed stuff you can get everything in place, drill some small (3/8 - 1/2 inch) holes into the cavities, squirt the foam in, and put your finish layer on.