I bought a home powder coating gun from Eastwood about 12 years ago. I did everything that would fit in a household sized oven with it, including the calipers. I haven't noticed any degradation in the finish on mine. its baked on at 400 degrees for 30 minutes. Eastwood also sells a high temp tape with which you can mask mating surfaces, mounting flanges, etc. that you don't want the powdercoating on. I'm sure that any reputable powder coater would have this tape.
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