If it's a part that I really need to stick and I'm in a pinch, there's always some invisible film that foils my plans. So just tell the mold that you neeeed it to stick, and it won't.

I'd run wax, no way an epoxy will stick.

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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment