I have pained calipers on 2 of my cars 02 Mustang GT and BMW 335i. I personally recommend G2 ceramic paint. they have endless colors to choose from and you don't need to fuss with removing the calipers from the car. Just clean them really well and a wire brush or a wire brush wheel for a power drill. works like a charm
2015 Mustang GT Premium
Mods: Lund Tuned, AWE Switchpath Catback, AirRaid CAI, Eibach Pro-kit Springs, 3.55 gears, Ferrada FR2 20x9 and 20x10.5, APR Splitter, RTR front Grill, Steeda subframe braces, Steeda differential bushings, Steeda IRS bushing support, BMR Vertical Links, BMR Lower Control Arm Bearing kit (BK055), BMR Front subframe brace.