I used to know a professional powder coater and he would burn it off in a pottery kiln. He did it at night, with the doors locked because, the smoke is so noxious it is a health hazard. Had the EPA found out about it they would have shut him down. Sandblasting would be the way to go. I have been able to get it off in the past by hammering the beejeebers out of it, cold, until the powder coating cracks and loosens and can be peeled off but, it is time consuming.
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