Permatex - Leading edge supplier of innovative products for auto enthusiasts, DIYers and professional technicians since 1909. Non-corrosive gasketing material designed for use on aluminum, iron and steel flanged mating surfaces. Fills gaps up to 0.015" and cures to a solvent resistant that will not tear or decay during service. Allows for easy disassembly, old gasket material can be removed with a putty knife. Great for split crank cases, water pumps, chain cases and transmission cases.