I did some more thinking and looking at the pics of failed calipers and this is what I decided would help.

I may still do the pistons, but it looks like most of the corrosion happens above the seal inside the bore. The pistons appear to be plated (hard chrome maybe), so not sure coating those is gonna do me any good.. that's unfortunate because its easier to jusy coat the pistons for sure :-)

I didn't mask anything other than the mating surfaces, so all the ceramic that's not on a machined surface is going to be blasted off. Not like the overspray will hurt anything, but figured if I'm going to do this, I'm going to do them properly.

I tested the fitment with the coated piston and they drop right in like normal, no issues.



I am likely going to leave the coating on the machined sliding surfaces you can see.. not sure if it'll matter though. I've done calipers that have slider/shim inserts that the pads ride on.. our calipers don't have those. Pretty sure the powdered calipers you'd buy from powerstop are powdered there so it probably doesn't matter. I also decided to coat the pins in the hopes that will prevent binding.