Permatex Copper Spray-A-Gasket Sealant Permatex Copper Spray-A-Gasket Hi-Temp Sealant is a rapid-drying, metallic copper sealant. Engineered to efficiently dissipate heat, thereby preventing gasket burnout and enhancing heat transfer, Copper Spray-A-Gasket fills hot spots and surface imperfections. Copper Spray-A-Gasket offers exceptional resistance to all types of automotive fluids, making it a reliable and versatile solution for various moto applications - including cylinder head gaskets, exhaust manifold gaskets and other high temp surfaces. Features: Fast-drying, metallic copper spray adhesive sealant Helps to dissipate heat, prevents gasket burnout and improves heat transfer Fills minor surface irregularities, fills hot spots and surface imperfections Resists all types of automotive fluids, especially gasoline Temperature range -50F to 500F (-45C to 260C) Suggested applications include cylinder head gaskets, exhaust manifold gaskets,and other high temp applications