powder coating how to remove

got my brakes back this weekend but unfortunatly it looks like part of the powder coating has gotten into 2 of the caliper piston barrels before i start gouging and scratching it off has anyone had this problem and do you think nitromors or something similar may shift it

am gutted as apart from the above the job is awesome

Ask the powder coaters what will dissolve it, and not the caliper bore? Coconut or soda blasting would work.

I used to mask the bits i wanted to keep with several layers of masking tape then get the nitromoors out to soften the coating only.

Then scrape off with a sharp blade(watch you don't damsage the piston barrel)

Be really careful though as it easily runs and can damage surrounding sections, also make sure the nitromoors doesn't stay on the tape too long as it will go through it.

they went back to the powder coaters in the end he acid dipped them and completely redid them. still havent found the rear ones yet though so going to take the car in on monday get the disks and fronts on then take my rears and do them quick

Vapour blast. Takes off the powder coating and leaves the metal untouched.

Not expensive either, I recently has an aluminum bike frame done and only cost me £25.00