Everyone tells me to use JB Weld, but I have not had good luck with it... maybe I'm doing something wrong, but J.B. Weld always turns into a grayish mess over time for me, when used on parts that get very hot.


I've had great luck with some of the high temperature automotive gasket sealants and the "make a gasket" compounds.

These work great for things like the muffler.

Just get the area immaculately clean before you apply it.