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PBlaster is an excellent product, but it's designed to be used cold. If you need to heat the stud to remove it, get it as hot as you can (holding the flame on the stud), remove the heat and give it a quick shot of WD-40 around the perimeter of the stud.
The idea is to expand the stud with heat and then quickly quench it with WD-40. The stud immediately contracts and then the WD-40 wicks into the thread, usually allowing it to unscrew easily with whatever Vise Grips you have. Expect smoke when you spray WD-40 on the hot surface, and wear gloves and eye protection.
I've used this method for nasty rusted shock bolts on cars with good success.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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