If that was a picture of one of my calipers, they were fresh rebuilds from VB&P that I did in a two-stage process. First was a layer of silver caliper paint over every exposed surface to seal them. I put the decals on where I wanted them, then painted over everything with red caliper paint. After removing the decals, I had nice red calipers with silver lettering. I didn't do the lettering on the rear calipers, as I was going to have to grind off a bunch of cast-in lettering to get a good, reasonably flat surface. Too much work, IMHO.
I tend to powdercoat everything, but I decided not to for the calipers - you have to remove every bit of rubber, make sure every opening is tightly plugged, make sure the cast iron is CLEAN, etc. It's a huge PITA unless you' have them stripped to the bare castings already.