If your still trying to do this, if your going to paint them use some tractor paint enamel with heavy coats. Do not spray paint them cause it wont stay nice. Get yourself some Universal black tractor paint and brush it on. It will last you for a long time.
If you powdercoat the coils they will bake the coating on with temps 800-1000oF, I wouldn't recommend heating the coils due to possibly weakening them. I would just paint with a good flexible paint (non-epoxy).
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