I am using the wide strips of this stuff to seal the seam between an enameled tub and a fiberglass surround. I decided to try it after finding that the movement of the fiberglass was to large for regular caulk to flex with. The strips look pretty cheesey, but I was confident that it would solve the problem, as they were firmly attached. However, every time the hot water hits it, the adhesive seems to soften, and the plastic expands and bows away from the wall. After it cools back down, it flattens out, but of course it has let in a bunch of water. The surfaces never had silicone caulk on them, and were cleaned with denatured alchohol, I let the strips dry in place, unmolested, for 24 hours.