I walked in the shop the other day and Fred was prepping a set of Porsche calipers. He simply runs masking tape across the pistons and trims it with a razor blade. The calipers will need to be clean for the masking tape (and paint) to stick. That's no easy task on old used calipers.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
