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J-B Weld 37901 ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz

4.2 out of 5 stars 2,959 ratings

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  • JB WELD EXTREME HEAT: Is formulated for repairs to iron, steel and metal in high temperature environments 1000°F / 538°C. Non-flammable, it contains no solvents or Volatile Organic Compounds (VOCs).
  • THE ORIGINAL COLD WELD: JB Weld was developed as an alternative to torch welding. Designed to be effective in extreme environments, once it sets, it creates a permanent bond stronger than steel.
  • SIMPLE TO USE: When fully cured, this metallic compound can be drilled, machined or sanded. It is great for repairing cracks, small gaps, seam connections or holes.
  • VERSATILE & DEPENDABLE: Ideal for repair work on : exhaust manifolds, pipe connections, mufflers, catalytic converters, outdoor grills, fire boxes, gas and commercial furnaces and water heaters.
  • DO IT YOURSELF: Big or small, you can DIY it with J-B. Our heavy duty adhesives repair & restore it right the first time. JB Weld delivers the legendary performance of the World's Strongest Bond.

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Product description

J-B Weld ExtremeHeat is formulated to allow for repairs to iron, steel and metal in high temperature environments (2400°F / 1300°C). When fully cured, this metallic compound can be drilled, machined or sanded. It is great for repairing cracks, small gaps, seam connections or holes in exhaust manifolds, pipe connections, mufflers, catalytic converters, outdoor grills, fire boxes, gas and commercial furnaces and water heaters. This product is water based, non-flammable and contains no solvents or Volatile Organic Compounds (VOCs).


f k t s h
Black RTV Silicone Sealant and Adhesive KwikWeld Quick Setting Steel Reinforced Epoxy TankWeld Metal Fuel Tank Repair Kit SteelStik Steel Reinforced Epoxy Putty Stick HighHeat 550 Degree Epoxy Putty Stick
Set Time 1 Hour 6 Minutes 5 Minutes 1 Hour
Feature Mold and Mildew Resitant Strength 2424 PSI Petroleum Resistant, Stops Leaks, No Welding Strength 900 PSI 800 PSI at Room Temp.
Cure Color Black Dark Gray Dark Gray Machine Gray

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Most helpful customer reviews on Amazon.com

Amazon.com: 3.4 out of 5 stars 487 reviews
wizardofozone
5.0 out of 5 stars Only for the BIG BANG Sheldon type person
19 June 2019 - Published on Amazon.com
Verified Purchase
70 people found this helpful
Charles A Walters
3.0 out of 5 stars Worth a try because it might save so much money, but it seems to crack, making it more or less useless
27 March 2018 - Published on Amazon.com
Verified Purchase
Customer image
3.0 out of 5 stars Worth a try because it might save so much money, but it seems to crack, making it more or less useless
Reviewed in the United States on 27 March 2018
tl;dr - I applied this carefully over a crack in my exhaust manifold, the paste cracked in the same place. Tried again, cracked again.

Long version: After 230k miles I ended up with a crack in the exhaust manifold of my Accord. It was a fine crack, and the manifold has long since been discontinued so it's an inordinately expensive part. The crack was on the back side of the manifold, next to the engine, so surface preparation was a nuisance but I did it very carefully. I applied the paste, let it set for a couple days (the instructions say one day), then started driving the car and the exhaust smell came back. I took off all the heat shields, put the inspection mirror behind there, and lo there was the crack.

I emailed JB Weld and they were helpful. They mentioned the importance of surface preparation, but adhesion was not my problem. They were kind enough to forward my email to their chemist who suggested reapplying waiting 24 hours, then running the engine at idle for 30 minutes to let the paste cure that way. I followed all the instructions the letter, but when I started driving the car again the crack immediately reappeared.

Now the paste does adhere well and withstands the heat well, and that's good. I'm sure in some situations this product is going to save people a lot of money, and since it's so very inexpensive compared to other ways of fixing the problem you should almost certainly try it. But this product doesn't seem to handle expansion well. Cracks appear in manifolds and fireboxes and so forth because they get hot and expand, so wherever you see the crack, that is exactly where the expansion happens. If that's where you put the paste and the paste doesn't expand well, the crack will come back.

I wanted this to work and tried very hard. JB Well products are great and their people are very helpful. But a product intended to patch expansion cracks that cracks under expansion doesn't make a lot of sense.
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59 people found this helpful
Speedviktm
5.0 out of 5 stars Pleased as punch - repaired a cracked cast iron skillet
9 January 2019 - Published on Amazon.com
Verified Purchase
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5.0 out of 5 stars Pleased as punch - repaired a cracked cast iron skillet
Reviewed in the United States on 9 January 2019
After cracking one of my antique cast iron skillets I figured I had nothing to lose and might as well give it a try, sure glad I did!!! I followed the directions buy thoroughly cleaning the crack, then using a Dremel with a small ball bit I grooved the crack to give the JB Weld something to adhere to. I cleaned the area with degreaser and applied the product. After 24+ hours the filler had hardened and I sanded it down flat. Tested overnight with water, no leaks. Cleaned skillet thoroughly and went through two seasoning cycles @ 500 degrees for 1 hour plus cool down time. I have used the skillet a few times since and the repair has held up.
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35 people found this helpful
Theodore A Mahon
1.0 out of 5 stars waste of money, time, and effort
19 November 2018 - Published on Amazon.com
Verified Purchase
31 people found this helpful
Decisiveshopper101
5.0 out of 5 stars Money saver. Good prep work and cure time is key.
4 August 2018 - Published on Amazon.com
Verified Purchase
27 people found this helpful