i blasted and powdercoated my calipers. then did the seals over, upon putting the pistons back in a i had a bitch of a time. i didnt want to use a c clamp on my new finish so i put a very light dap of olive oil on my piston and they slid right back in. now im thinkin..fuck, oil reacts with brake seals

. but maybe im out of the woods because i used food grade oil and not petroleum based