Review on 🔧 Permatex 80335 Muffler and Tailpipe Sealer: Ultimate 3 oz. Solution! by John Rivera

Bought for my daughter. Their exhaust system was rusted all over, especially the top of the resonator. Sometimes a spot of rust shows up leaving an inch wide hole and a very noisy car. Luckily for them, this sealant can hide fairly large holes. The only thing is that it might take multiple uses to close the gap over a big hole. Usually she applies something to the edges of the hole, waits 30 minutes, starts the car for 10 minutes, waits another 30 minutes for the car to cool down, and then repeats the process. For a particularly large hole, this may need to be done 3-4 times. But she says if you're patient, you'll seal them eventually. There is enough in the tube to fill maybe two or three large holes (and by large it means an inch wide). You can also use this to caulk rusty joints. He can't work miracles, but he bought her at least 6 months before her exhaust system was beyond repair.