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Old 06-21-2016, 11:50 PM   #11
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William,

That'* good for an epoxy putty, but normal JB Weld says it can do 550 degrees and has a tensile strength of 3960psi.

Maybe some kind of high temperature silicone would handle the expansion/contraction better if the JB Weld fails?
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Old 06-21-2016, 11:51 PM   #12
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Something like this: Hi-Temp Red Silicone | J-B Weld
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Old 06-21-2016, 11:57 PM   #13
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I'd not use something silicone based, you want the Epoxy stuff that hardens when used for sealing a crack in a LIM.
What I posted a link to earlier is all I would have attempted to use.
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Old 06-22-2016, 04:52 PM   #14
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I wouldn't even attempt to seal something like that. Thing with cracks is, they get bigger over time. Do it right the first time.
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Old 06-22-2016, 06:31 PM   #15
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Of course Mike, totally agree, sealing a crack like that is only ever a temp fix.
The constant heating up, and cooling down cycles would definitely make it bigger over time.
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