seems to be successful compared to others but it worked for me. My catalytic converter had 1/3 of the bolt broken so I used it to seal the flange and even at 7000rpm there were no leaks or bursts. It dries like cement but is easy to clean when it needs to be resealed. I sealed the flange just in front of the oxygen sensor, the engine light didn't come on but it smokes and smells a bit, but when it first warms up it goes away after a few miles.
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