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Stuff worked great for my application. I had about an 1/4” x 1.5” crack/ rusted out area in my exhaust pipe. It in right next to where piece of heat shielding attached so it was easier to fill, but it would of worked if it was just a 1/4 crack anywhere. Applied as directed and worked great, amazing in fact. It’s only been a week, so idk how long it will hold. The pictures show prior, right after application and fully cured. It smooths out nice too. Still for a lot left in the tube.
UPDATE MARCH2020: so after about a year this stuff fell off, but I think it was due to some other variables. Still, for a patch to hold a year is great! I just applied more today, the hole is still the same size too so It’s good it didn’t get worse. My muffler has a lot of surface rust, but this is the only hole and it still seems solid- so if I keep patching this every year, for 6$ and about 5 min of work, I can’t complain! Truthfully it lasted longer then I expected. Probably enough left in the tube for maybe one more application (3 total applications, but I put a lot on). It still get 5 stars!
This was purchased for my daughter. Her exhaust system is all rusted out, particularly on the top part of the resonator. Occasionally a rust spot will give out and leave her with an inch-wide hole and a very noisy car. Luckily for her, this sealer can cover up some pretty big holes. Only thing is it might take several applications to bridge the gap over a large hole.
Usually what she’ll do is apply a bit around the edges of the hole, wait 30 minutes, run the car for 10 minutes, wait another 30 minutes for the car to cool off, then repeat the process. For a particularly big hole it may take doing this 3-4 times. But she says if you’re patient, you’ll eventually get it sealed.
There’s enough in the tube to fill maybe two or three big holes (and by big she means an inch wide). You can also use this to seal up any rusty joints. It can’t perform miracles, but it did buy her at least 6 months before her exhaust system was beyond patching up.
Worked very well. Saved me money to pass inspection. Excellent product! This is an update on my previous review. My repair is still going strong since April. I used it on my catalytic converter. My check engine light was on as I had an exhaust leak. Used the Permatex to fix the leak after resetting check engine light. I had to fix it in order to pass inspection. Product works great. *** This is an update to kast years review. Well it’s been almost a year and the fix is still holding and I couldn’t be more happy with this product. It was a quick fix that has lasted and I can say that being sceptical at first, this stuff is great. Thanks Permatex for a great product and I highly recommend it.
I used this stuff to seal a leak at the exhaust flange between the cat and the tailpipe. Just squeezed the stuff into the rusted (but wire brush cleaned) gap between the two flange halves and no more leak. The dealership charged me $400 to fix the leak at the other flange and do you know what they did ... they cut the flange out and welded in a piece of tube so now when I change the exhaust I have to change the cat too. Don't let the dealer give you a headache, buy this stuff and save money.
Make sure you squeeze tube to mix. I had a hole in my exhaust and this worked great. I wet the area where I was applying, took aluminum foil, put a car jack under the exhaust and put the sealer on the hole and applied to pressure with the car jack. Let it sit for an hour and then turned on the car and let it run for another 40 min. Lowered the jack to remove the aluminum foil and it was nice and set.
I rebuilt a portion of my exhaust and I had two flanges that didn't meet together like they should which left a small gap at the bottom. It wasn't bad enough to cause an audible exhaust leak, but condensation would leak from it. I figured some exhaust sealant would be a quick fix as opposed to resetting and re-welding the flanges back on.
I was a bit dismayed when I received the product and realized it's not epoxy or solvent based, so I wasn't sure how effective it would be. I went ahead and tried it following the directions and it worked absolutely fantastic. It goes on fairly smoothly-- sort of comes out in globs, but it's easy enough to work into a nice bead. Evidently it's made from some sort of clay, but it worked like magic and hardens almost like a super smooth cement. I don't see it coming off anytime soon.
Instructions go something like this: wet the area apply the product wait 30 minutes start engine and let run for 10 minutes.
After that engine running period it's pretty well cured by that point, but I'm certain within a couple hours you're good to go. I would definitely buy it again.
I used this to patch some bad flange connections, which had some big gaps, and it sealed very well. You have to be careful to follow instructions, and wait appropriate drying times.
Unfortunately, or fortunately, I won't be able to give it a long term test, because shortly after I made the repairs, I went and had the bad sections professionally replaced/welded, because there were some parts, like the flex pipe, that were beyond patchable.
If I had to make a patchable repair in the future, I would use this again.
I have to say I was hesitant on whether this was gonna work to patch a small exhaust leak I had before I could make it to the muffler shop and after I applied it to a couple spots that needed it following the directions and then let it dry over night. To my surprise it dried really hard and no leak was felt in the area applied. If this holds up it may save me some money and buy me more time before visiting my muffler shop. I guess time will tell but as of now its doing it's job and I am pleased.
This stuff was a life saver. My exhaust pipe has 2 cracks in it at joints. I followed the instructions, brushed with the wire brush and wet it with some water then applied the stuff and let it sit for 30 minutes, and then let the car run for 10 minutes. Instantly, I could tell there was major improvement . I ordered another tube to put on another layer to make sure I sealed any remaining holes in the fix. This time I turned the car on and listened around for the leak. Found where it was leaking and directly applied the sealeant until I had sealed it all. Let it set again, ran the car 10 minutes for the final setting and then done!! 1.5 tubes (about $11 in all) has transformed my car from sounding like a machine gun to quiet as a mouse. Love this stuff. Will definitely buy again if this one wears off.