Permatex 3 oz. Tube Form-A-Gasket #1 Sealant. It seals cut gaskets and fills uneven surfaces. It has a hardening formula that dries fast and sets hard. It resists common shop fluids and fuels from 65 degrees Fahrenheit to 400 degrees Fahrenheit at pressures up to 5,000 PSI. It is for freeze plugs, manifold gaskets and threaded connections.