J-B, 2 OZ, High Heat, Epoxy Putty, 3 Times Stronger At High Temperatures Than Conventional Epoxy Putties, Withstands Continuous Heat Up To 450 Degrees Fahrenheit & Intermittent Heat Up To 500 Degrees Fahrenheit, Strength Of 800 PSI At Room Temperature & 600 PSI At 400 Degrees Fahrenheit, Perfect For Tail Pipes, Mufflers, Machinery, Engine Blocks & Exhaust Manifolds.