-Fast-drying, metallic copper sealant helps dissipate heat, prevents gasket burnout and improves heat transfer. Fills minor surface irregularities. Seals instantly. Fills hot spots and surface imperfections. Temperature range -50°F to 500°F (-45°C to 260°C); resists all types of automotive fluids, especially gasoline. Level 3 -Suggested Applications: Cylinder head gaskets, exhaust manifold gaskets, and other high temperature applications. -Suggested Applications: Cylinder head gaskets, carburetor gaskets, exhaust manifold gaskets and other high temperature applications