A close-up of a J-B Weld ExtremeHeat metallic paste container next to a rusted exhaust manifold with a sealed crack using the gray paste.

J-B Weld ExtremeHeat Reviews: A Solid High-Temp Fix That Actually Works

ByWelderology Team

When you’re dealing with cracked exhaust manifolds, busted fireboxes, or engine blocks, high heat demands more than just your average epoxy. That’s where J-B Weld ExtremeHeat steps in. This 3 oz metallic paste is designed to handle temps up to 2400°F, making it a go-to option for welders, mechanics, and DIYers needing a reliable fix…