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biffdotorg
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I did note the the JB weld High Heat is in that range. The JB weld Extreme heat is rated higher. And they mostly talk about exhaust systems for their purpose. Who knows.![]()
Permatex® Muffler & Tailpipe Sealer - Permatex
www.permatex.com
It is kaolin based which is a silica based clay material. Similar to JB Weld exhaust products. No experience using it but I have seen very little that is rated above that 700f rating.