Permatex copper spray 101MA  9 oz 

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 -45C to 260C; resists all types of automotive fluids, especially gasoline.

Suggested Applications: Cylinder head gaskets, carburetor gaskets, exhaust manifold gaskets and other high temperature applications