Painting bolt heads

on body bolts, I sandblast the heads of the bolts, put them on a cardboard with holes punched in it, and spray them with a light coat of epoxy primer and then just enough paint to cover them and make them a little glossy. Them I tighten them by hand and use a 6 point socket. Then touch up afterwards with a brush, if needed. I also use a socket that I don't use on greasy, grimy parts.