J-B Weld 8297 HighHeat 500 Degree Epoxy Putty Stick - 2 oz. , Grey

Good product, fast shipping.

This stuff is awesome. I use it on everything.

I had a dime sized rotted spot on the families mini van muffler that was becoming increasingly loud. I decided to use this product to see if it would plug the hole and quiet the vehicle down some . The goal was not a long term fix, just one that would allow me to push off the $500 visit to the shop for another month or two. After cleaning out the hole and surrounding rust, I found I now had a walnut sized hole to fill. Furthermore, the inside of the muffler was filled with wet rusted metal flakes. I became skeptical that the product would work for this application but was fully committed at that point. The product mixed and installed as expected. I used it in two layers, the first (1/2 stick) was tucked into the hole with emphasis on getting some putty inside and behind the edges of the hole so it would grab and not blow out. The next application (2 hrs later) filled the void completely . ( This took about 3/4 of the epoxy stick in total). I allowed it to rest overnight . When I started the van the next day, it still had a rumble (from the internal rotting of the mufflers baffles) but it was significantly quieter. It's been a week now and it seems to be holding up just fine. The van will go in for a proper repair next month but this was a good stop gap measure that was well worth the hour and funds invested.

I have this on-hand in case my old beater muffler gets a hole in it. It cures quick. I haven't used this batch yet but I know it works already. I've used JB Weld before. It's tough. This one is high temp and good for many uses. It's easy to use, just knead the two parts together and use it like putty. Clean the surface well and if suitable, sand the area lightly and you will get good adhesion. Make sure you clean the area with some brake cleaner or something like that to remove all oils. If you keep adhesives refrigerated you can extend the storage life dramatically

The welds on my exhaust pipe for the resonator were starting to separate and I've been using this for a good year to repair the cracks in the pipe from those separated welds. Since then, the exhaust has deteriorated further and a dime sized hole developed in it (between the catalytic converter and the muffler) and my car sounded like a demolition derby. I sanded the area and wiped it with some degreaser, used what I had left of the tube (about 1 quarter) to make a disk to cover it and stuck it over the hole like that flex tape infomercial guy (engine wasnt running tho). I made sure it was well mixed and covered the hole well. Even gave it at least 15 hours to cure before running the car and is till holding up well after about 500 miles of mostly highway driving. I'm going to get my exhaust replaced soon I think or any damage professionally repaired at least, but so far this seems like a semi-permanent fix for exhaust pipe repair for sure!If you have minor to even moderate exhaust damage in your car and looking to bide yourself some time or the leak is in a spot that's going to cost a lot of money to fix, I highly recommend this product as a real solution. If you use it correctly, it will work!

I'm a fan of JB Weld, and maybe I was asking too much of this product, but I was still disappointed. I used this to mate an exhaust together using a sleeve over both sides, so the JB Weld really only needed to hold the sleeve in place.. but it cracked and broke. It did dry up pretty quickly, and was very hard. Maybe a bit too hard, as the crack may have been from a shock while it was warm that it just didn't like. This was right at the end of the tailpipe and the beginning of the muffler, so not at the manifold, past the resonator, so it certainly gets hot, but not outside of the range that this product claims to be good for. I just don't think it was the right application for this product, though it sorta seemed like an ideal use for it. I had better luck with those wet-n-wrap epoxy cloth kits in this specific scenario. I specifically made an effort to keep the stress on the area as low as possible by using a coupling pipe between the two, but the JB Weld High Heat just wasn't up to the task.At least it wasn't a goopy nasty mess like the resin cloth stuff.. that stuff was nasty to work with. This stuff was much neater and cleaner, but for this use case, just couldn't do the job.I still love ya, JB Weld, but this one was a little underwhelming.

EXCELLENT

It did fix the coolant leak. I cleaned up the surface and I applied it on dry metal and I even scratched the surface where I applied it to make more sticky. It has resisted high temperature of a semi truck diesel engine. It is still sealed