Permatex 80335 Muffler and Tailpipe Sealer, 3 oz., Plastic

Great stuff to use when sealing up an assembled exhaust kit for my f150. Easy to apply. Been on for 6 months with no leaks.

I searched for a long time before deciding on this product to provide an extra seal to my exhausts catalytic converter flange. The flange in front of the cat was leaking, and so I r&r'd the old bolts, and then I wire wheeled the mating surfaces. Despite this, there was still a decent bit of pitting, and this 'sealant' worked well to fill in any imperfections that were present. I did this roughly 6 months ago, and daily drive the vehicle - no leaks from the area that was patched. I even reused the old 'donut' gasket since I didn't want to spend any extra money or time on this repair. I would recommend this to anyone who is working on an older vehicle with a rusty exhaust, or to anyone who wants to exercise an abundance of caution when trying to prevent any exhaust leaks following a repair.

The product itself is awesome. Seems anything I buy from Permatex does what it is supposed to do. For this particular "repair" I was a bit unsure as to which Permatex product to purchase. My motorcycle exhaust has a connection where the header pipe and tailpipe meet. An aftermarket "Jardine" exhaust and oddly quite a large gap at the connection whereas the bracket is supposed to crimp and does not do a very good job at sealing it. This may be how it was designed but for me an exhaust leak in your plan is not a good plan. Bottom line i wanted to seal this joint but wanted the option to take it apart to install new header gaskets down the line. Reaching out to Permatex they actually recommended a different product that was twice the cost of this with half the temp limit. I am happy I chose this as it sealed the joint and I was able to disconnect the pipes and install the gaskets. I am now looking to try a "lap joint" bracket as I would prefer a more permanent solution. I feel anything with the Permatex name is a good product but has limited shelf life and will eventually break down. The trouble is they make so many similar products it is hard to choose the correct one. In my opinion there is not one single best application for a particular project. Doing some research prior to buying is always recommended.

Works good on seams that leak on a muffler. Used all of it. Not expected to be permanent but, works as a great improvement for muffler leaks. Less expensive than replacing a muffler.

I’m pleasantly surprised by the usefulness of this stuff. I feel like a real muffler man

This is decent for a temporary patch. Please don't expect this to hold up long term but for short term repairs this does the job. Over time it crumbles away.

Solid stuff that seals/dries hard and stays in place. Good for a bandaid fix and/or for ensuring tight leak free connection on a band clamp.

Good product. Worked well as advertised.