Genuine Permatex 35580 Copper Spray-A-Gasket Hi-Temp Sealant is a fast-drying, metallic copper sealant designed to help dissipate heat, prevent gasket burnout, and improve heat transfer for enhanced sealing performance. This advanced formula fills minor surface irregularities and resists all types of automotive and industrial fluids. It provides a reliable seal across a wide temperature range from -45°C to 260°C (-50°F to 500°F). Ideal for cylinder head gaskets and other high-temperature applications requiring a durable, leak-proof seal. The 331ml aerosol can ensures easy and precise application.