I did my stock front and rear calipers exactly one month ago, with exactly one can of Plasticote red Brake Caliper spray paint form Pep Boys. I put the car up on jack stands, took off all 4 wheels, masked around each caliper closely and covered the entire inner wheel well with newspaper. I first cleaned each caliper with WD-40 (that miracle spray !), then wiped the WD-40 off with a toothbrush and paint thinner. I put a light coat on all 4 calipers first, waited an hour each time, put about 5 coats on each, with the last coat being the heaviest. I waited another hour or so, got the dremel tool out and cleaned off the NSX on each caliper. VOILA !!!!
They look beautiful, I've done quite a bit of hard driving in the last few weeks, and they still look great.
Took me an entire Saturday, but it was well worth it.