Canoes and kayaks have foam cushions glued to the inside of the hull to
kneel on. For that kind of foam you could ask at rec.boats.paddle.

the adhesive used for rigid foam in house building is polyurethane (PU in
the previous post) in the caulking gun tubes. the spnonsons on my one
sheeter Loonie are glued up out of two layers of rigid foam with that glue
in 1998 and are still holding. I've glued rigid foam to plywood with it. Has
held okay.
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