This product does it all! PERMA-FLEX comes in an aerosol can with extension nozzle that delivers a seal, caulk, bond or gasket that insulates and waterproofs. Product dries to clear finish, PERMA-FLEX is one hundred percent silicon rubber and won’t shrink or crack. PERMA-FLEX bonds and fastens metal, rubber, plastic, wood, tile and more and is effective from -60˚F to 450˚F.