Permatex Copper Spray-A-Gasket Hi-Temp Sealant is a fast-drying, metallic copper sealant that helps dissipate heat, prevents gasket burnout and improves heat transfer. Fills minor surface irregularities. Seals instantly. Fills hots spots and surface imperfections. Resists all types of automotive fluids, especially gasoline.
Temperature Range: -50°F to 500°F (-45°C to 260°C) intermittent.