J-B Weld HighHeat is a 2-part epoxy system that provides strong, lasting, heat-resistant repairs up to 550F. Mixed at a ratio of 1:1, it forms a permanent bond that has a 4730 psi strength and is chemical and fuel resistant. At room temperature, HighHeat sets in 1-hour and cures in 24-hours. HighHeat's cure time is accelerated by heat and can cure in 1-hour at 250F. Features: Strong, lasting, heat-resistant repairs up to 550F Forms a permanent bond that has a 4730 psi strength Chemical and fuel resistant Fast 1-hour cure with heat Great for: engine blocks, mufflers and tailpipes, radiators, grills and stoves, other hi-temp projects Re-sealable no-waste cap Can be shaped, tapped, filed, sanded and drilled after curing Sets to a dark grey color