I paint all the hardware off the car. I bead blast the hardware. Apply one coat of epoxy, and as little paint as I can. When installing, tighten the hardware as finger tight as it can get. Finish with a socket lined with masking tape, or tape around the bolt head, or both if it will fit. Once a panel is aligned, tighten only a few fasteners until you are sure it is right. Once you have it perfect tighten everything up. It is inevitable to get a chip or nick, but touch up is each and never noticeable since the paint is thin.