800 PSI
Set Time
1 Hour
Cure Time
8 Hours
Cure Color
Machine Grey
Use On
  • Automotive
  • Metal
  • Specialty Products
  • And More

J-B ExtremeHeat™

3 oz.

ExtremeHeat™is an epoxy putty specifically formulated to bond and repair materials that will be exposed to high temperatures in automotive and industrial maintenance applications. It cures to a tough, hard bond with little to no shrinkage. This industrial-strength product outperforms conventional epoxy putties at high temperatures and sets in 1 hour at room temperature. After 8 hours, it can be drilled, tapped, machined, ground, filed and painted. ExtremeHeat™is rated at a tensile strength of 800 PSI and cures to a machine grey color, withstanding temperatures up to 2400°F.

Great For
  • Filling cracks and holes on metal surfaces
Made in the USA US flag

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Prepare: Clean repair area of dirt, grease, oil, paint, rust, etc.
Mix: Remove required amount of putty. Thoroughly knead putty with fingers to a uniform color.
Apply: Press firmly to the surface to be repaired.
Dry: Sets in 1 Hour. Cures in 8 hours.