g3 makes a great quality caliper paint in a ton of colors. 37$ shipped. the way i did mine was in conjuction with a brake pad rotor and brake fluid replacement. while i had the system apart i pressure washed the calipers and used a brake cleaner to fully clean the calipers. then started painting. theres enough paint to do 4 calipers with 3 to 4 full coats. after installing new rotors stainless brake lines and pads and motul blue fluid the whole setup is clean flushed and ready for use!