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JB Weld 8297 HighHeat High Temp Epoxy

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0.50 LBS
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Brand: J B Weld

JBW8297 J B Weld High Heat Epoxy Putty Stick, for Manifolds, Tail Pipes, Mufflers and Other High Temperature Projects. Recommended by Calvan Tools for exterior threads of their spark plug inserts to seal and hold securely in place. Commonly used with Calvan 38900 and 39300 spark plug thread repair kits. Made in the USA.

JB Weld 8297 HighHeat is a hand mixable epoxy putty stick 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. HighHeat is rated at a tensile strength of 800 PSI and cures to a machine grey in color. It is able to withstand continuous heat exposure of 400ºF and intermittent heat exposure to 550ºF

  • Exhaust Manifolds
  • Tail Pipes
  • Mufflers
  • Engine Blocks
  • Duct Work
  • Machinery
  • High Temperature Projects


1. Cut: Remove required amount of putty.

2. Mix: Thoroughly knead putty with fingers to a uniform color.

3. Apply: Press putty firmly to the surface to be repaired. 

*For best results use a detergent or degreaser to first clean the surface, then roughen the surface with a file or coarse sandpaper to provide the best repair. Apply only to clean/dry surfaces.

Set Time One Hour. Cure time 8 hours.

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3 Reviews

  • 5
    Easy to work with

    Posted by Jim C. on 9th May 2020

    Seems to perform well. Easy to use.

  • 4
    Good product

    Posted by James E. on 12th Dec 2016

    Have never had a bad experience with JB Weld products. First experience with this particular one. Used during repair of spark plug thread repair on a 2001 F150 5.4L (with a Calvan insert). Wasn't too sure about the application, as it almost didn't make sense to use a clay-like substance on threads of an insert. I would suggest applying on a warm day if possible,as it was rather chilly when I did..which I believe made it a little less pliable. It has held really well thus far.

  • 5
    JB Weld - High Temp

    Posted by Mark on 21st Apr 2016

    Typical JB Weld - fantastic products! I use them all the time and have never, ever, had a problem. Keep up the great work - JB Weld!!!!

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