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A dark grey epoxy putty tube, two ounces, high-heat formula

J-B Weld

J-B Weld 8297 High-Heat Epoxy Putty, 2 oz, Dark Gray

SKU CH-A17W-SNQF2

High-heat epoxy putty repairs metal up to 650°F and cures in eight hours

  • ColorDark Gray
  • Size2 oz
  • TypePatching and Repairing Compounds
  • Withstands 650 °F for exhaust and engine repairs
  • Cures in 8 hours to a sandable, machinable finish
  • Bonds metal surfaces at temperatures down to 32 °F
  • Ready to handle in 1 hour for faster turnaround
  • Low 215 g/L VOC meets strict air-quality limits

High-Heat Epoxy Putty for Metal Repairs

J-B Weld 8297 is a two-ounce epoxy putty formulated for patching and repairing metal components exposed to extreme temperatures. The dark grey compound bonds to metal surfaces and cures fully in eight hours at room temperature. It is designed for automotive exhaust manifolds, tail pipes, mufflers, engine blocks, duct work and general high-temperature machinery projects.

Thermals and Working Properties

The putty withstands continuous service from 32 degrees F up to 650 degrees F, making it suitable for sustained heat cycles on exhaust and engine parts. It offers a one-hour working window before the maximum setting time is reached, allowing time to shape and position the repair. Once cured, the material is sandable, machinable and paintable for finishing. VOC content is rated at 215 g/L.

Two-Ounce Tube Format

Supplied in a 2 oz tube, this quantity suits single repairs or small maintenance tasks rather than large-scale resurfacing. The container size limits total coverage, so buyers needing to coat extensive areas or multiple components will require additional units. The product is restricted from sale in certain states; verify local regulations before ordering.

Highlights

  • Withstands 650 °F for exhaust and engine repairs
  • Cures in 8 hours to a sandable, machinable finish
  • Bonds metal surfaces at temperatures down to 32 °F
  • Ready to handle in 1 hour for faster turnaround
  • Low 215 g/L VOC meets strict air-quality limits

Specifications

BrandJ-B WELD
ColorDark Gray
Size2 oz
TypePatching and Repairing Compounds

Questions about this item

How do I apply the putty to a metal surface and what step is often missed?

Knead the two-part epoxy until the colour is uniform, press it firmly onto the clean metal within the 1-hour working time, then let it cure for 8 hours; skipping the full knead leaves uncured streaks.

Will the repaired area need any recoating or replacement after it cures?

Once fully cured the epoxy is sandable, machinable and paintable, so the repair can be finished like the surrounding metal and does not require scheduled recoating.

At what temperature does the bond start to lose strength during continuous exposure?

The putty is rated for a maximum performance temperature of 650 °F; sustained heat above that level will degrade the bond first.

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