Quote:
Originally Posted by hanleyclifford
No thread sealant should be used on a pipe hot section. It will rust and carbon itself together nicely, and should be completely replaced when necessary.
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Agree completely...pipe thread seals when tightened. There is a possibility of a drip if you do not (or cannot) bring those pipes tight in the orientation you want your hot exhaust to lay. Normally you can work it, with two good pipe wrenches, and seal the whole thing piece by piece in the orientation you want.