Permatex Anaerobic Gasket Maker is a non-corrosive gasketing material specifically designed for use on aluminum, iron, and steel flanged mating surfaces. It's perfect for on-the-spot and emergency repairs, or when a traditional gasket is unavailable. This sealant fills gaps up to 0.015" and cures into a solvent-resistant seal that won't tear or decay during use. Even after extended service, parts disassemble easily.