How well does spray foam adhere to the substrate?
It has excellent adhesion characteristics it will adhere to wood, metal, glass densglass just about any thing. It will not adhere to a wet surface, oily surface or plastic vapor barrier with vapor barrier it will curl. You can remove it with a wire wheel or a 3000 psi hot water pressure washer with a turbo tip. Urethane spray foam is the material that is used on the Space shuttle external fuel tanks they have trouble with the adhesion at 14000 mph.
