Permatex Fuel Tank Epoxy Putty is a two-part, hand-kneadable epoxy putty stick designed for repairing metal gas tanks and containers. The contrasting colors of the two parts blend into a uniform color when thoroughly mixed, indicating the epoxy is ready for use. Once fully cured, the resulting adhesive can be drilled, sanded, threaded, or filed, and it's resistant to fuels and most solvents.