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I use this to repair the seals on my cast iron wood stove . Where the stack attaches to the main body of the stove. For 35 years I was not able to effect a really good seal. Now I placed some some of this Permatex 80355 Muffler and Tailpipe Sealer in place and then tightened down the flange bolts. Made a perfect seal. Since there is no back pressure I expect this to last for a very long time. I then went ahead and lifted up the top plate of the stove (cast iron also-very heavy!!) and cleaned the mating surfaces around the edges since there were leaks in several places(mating surfaces are about 3/8" wide). Applied Permatex 80355 to the surfaces that needed sealing and carefully lowered the top back in place. Tightened the 1/4" 20 bolts . Same results, a perfect seal with no leaks!!. Again, I expect this to last a very long time since the temperature never gets higher then 700 degrees F with zero back pressure. Over the years I have used all kinds of high temperature stove cements and sealers with poor results. This is the first product that I have used that has been outstanding even though it was not used for the intended purpose.Read full review
Verified purchase: Yes | Condition: New
Very good poduct for the price. Made in U.S.A., easy to use, just like sqeezing out toothpaste. Filled the small hole I had in an exhaust pipe, cured quickly to a substance that really felt as hards as metal, and the same color gray. I let it sit over night before driving, it didn't say that was necessary but I wanted to give it the benefit of more time before using the car. So far it's holding up, it's only been two weeks, hope it lasts a while. 9 months for even more I'll be saitisfied.
Verified purchase: Yes | Condition: New
Product perfectly sealed a new exhaust pipe to my thirty-year-old truck exhaust. It was easy to apply and has worked without issue for several months now.
Verified purchase: Yes | Condition: New
I had an exhaust flange that kept blowing a gasket. Even a new replacement gasket would leak due to the warped flange. I followed the directions on this stuff and fixed the exhaust leak. I was going to replace my exhaust if this didn't work. IT WORKED!!! I saved much $$$$$$
Verified purchase: Yes | Condition: New
Had a rather large gap to fill in my wrangler exhaust. This stuff seems to work pretty good when compared to othe products I have tried.
Verified purchase: Yes | Condition: New
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