9 oz. net wt. Fast-drying, metallic copper sealant Helps dissipate heat, prevents gasket burnout and improves heat transfer Fills hot spots and surface imperfections Seals instantly and resists all types of automotive fluids, especially gasoline Temperature range of -50F to 500F Permatex Copper Spray-A-Gasket Hi-Temp Adhesive Sealant is a fast-drying, metallic copper sealant that helps dissipate heat, prevents gasket burnout and improves heat transfer. It seals instantly and fills minor surface irregularities and hot spots. Resists all types of automotive fluids, especially gasoline, and has a temperature range of -50 degrees Fahrenheit to 500 degrees Fahrenheit. Suggested applications include cylinder head gaskets, carburetor gaskets, exhaust manifold gaskets and other high temperature applications. When a chemical gasket is not an option, Permatex offers a wide range of gasket sealants suitable for applications on both import and domestic vehicles of any model year or performance caliber.
What is there to say? This is Permatex copper gasket sealant spray. Modern head gaskets don't often use a compound like this. However, I needed this for use on an older composite gasket and it works as well as the similar products in common use decades ago. I have also used this on thermostat gaskets and a few other places where I wanted to seal a paper gasket. It does what it is supposed to do.