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

(Picture is this product with more JB weld steel stick above it) Good price tag, good product, and does its job. It does really well to prevent leaks on blocks, even aluminum blocks as well, this block had a crack and was leaking oil, but after applying the extreme heat with more jb weld thats steel stick, it held up amazingly. No leaks, holds tight and strong. It was also really easy to apply, a bit messy and stinks but nothing to unusual, and dries until a few hours so its best to give it time to cure, will be using again.

This stuff is amazing. I used it to repair a a gas heat exchanger while I wait for the replacement to arrive. The product has performed perfectly

May dry out in the container so I suggest you use it all on one thing. Great product otherwise

I purchased this item to repair an ash fettle in an old Vermont Castings wood burning stove, and it completely exceeded my expectations outlasting an entire season of direct fire contact. The fettle was cracked into two pieces and a prior owner had drilled two holes on either side and tried to connect it with an aluminum "bridge." The repair interfered with the door closing, so I needed to seamlessly "weld" the two cast iron sides back together. Before going through the trouble of taking it to a welder and paying to have it repaired properly, I took a chance on this J-B Weld ExtremeHeat.I used a Dremel tool with a fine grinding stone and cleaned up the two broken faces, along with about 1/4 inch of the area on either side of the crack. Following the advice of another review, I then took a cotter pin, stuck it into the chuck of my battery powered drill, and used that to thoroughly stir the J-B Weld in the container (this is a one-time use container... once opened and stirred, use it and toss the rest). After stirring for just under 2 minutes, I immediately applied it to the two surfaces, pieced them together, and then spread a little more on either side to ensure a supported bond. I then set the item on a flat piece of cardboard to cure for 2 days. (NOTE: you have to support the joint while curing, because the J-B Weld provides no structural support until completely cured. While wet, the item will just fall apart again if the pieces aren't otherwise held together.)When it was done, I replaced the fettle and lit the first fire of the season (crossing my fingers at the same time). Several months and probably 100+ fires later, the piece was still holding strong like the day I put it in. The fettle sits right against the fire, and many logs have rolled into it while it was extremely hot, with no noticeable damage whatsoever. I would absolutely recommend and use the J-B Weld ExtremeHeat again on future projects. As long as the proper preparation is done, and you follow the instructions, it's an awesome product!

I used J-B Weld Extreme Heat to patch a pinhole in a 64qt stainless steel pot. After applying and letting it cure, I placed the pot on a propane burner for over 3 hours. Despite the high heat and long duration, there were no leaks at all. The product held up exactly as advertised—super impressed with its performance under extreme temperatures. Highly recommended if you need a high-temp, durable fix.

The media could not be loaded. Why don't they have zero stars available on this app? I just wasted a ton of time trying to glue holes on a muffler on a motorcycle that I bought. Somebody drilled holes in it to make it louder. Anyway this is 10 hours later and after mixing it very very thoroughly, it is still very weak. I was surprised when I took the top off and the two parts are just sitting together. Why is that? Then I mixed it and it was very liquidy. Very watery. Why would you want something like this to be watery?

I would give the JB Weld five stars, but I have to use the whole jar for a single repair. Yes it is capable of strong, high temperature repairs, but it gripes my boat to have to use a whole jar for a single repair! And yes, I have more than one jar on hand.

Works great! I had an exhaust manifold mounting point break in half due to me using the wrong length bolt. This is an engine from the 60’s so parts availability is little to none. Figured I’d give this stuff a try before I tried to find a replacement head. I used a teflon bolt and washer to keep the jb weld from going where I didnt want it to and to keep me from having to drill and tap it after it cured. I’ve put about 3 hrs of drive time on it since the repair and it’s holding great so far.