This is a FEC654 Aerosol Foam. Multiple-use foam curing to a semi-rigid closed cell mass. Can be used on a car, boat, or house for caulking & sealing & filling. Will adhere to metal, fiberglass or wood. Waterproof. Cures in 20 minutes. Can be cut, sanded or painted. By the absorption of moisture expands approximately 50% during cure.