I have inspected the Supertech 89.2mm pistons that came out of the Perrin EZ30R motor, and they are in great condition. Measurements are right on, and skirt wear is minimal. They had pretty significant carbon deposits, so I cleaned them in an ultrasonic cleaner. I now have the bare pistons, and would like to get them coated. When they came from Supertech, they had a phosphate dry lubricant coating, but that coating is mostly gone now after the cleaning.

Any recommendations for a place near by (Portland) that can do replacement coatings? Any issue coating a used piston? Does it have to be media blasted?