I will use a painted spinner blade for my own baits but when people ask me to make a spinnerbait with painted blades for them I refuse as there is no way to keep them from chipping. Now, with a chatter blade there are some things you can do, number one is the blade, the best material to paint is raw steel, they make steel spinnerbait blades to paint because they paint will adhere better to the steel instead of brass. You could use a powder paint, coat the blade, use some light wire to hand it so you can bake it in the oven to cure, and then clear coat it with seal coat or Dick Nites, Devcon 2 ton epoxy will add to much weight to the blade, I'm not sure if it will affect the performance of a chatterbait but I know a heavy blade isn't great on a spinnerbait.
EDIT: I almost forgot, look for a product from component systems called "Quick Coat Lure Marker", it isn't ink like a Sharpie, instead it is actual paint and even needs to be shaken like a rattle can and sounds the same too. Get the black marker and paint the blade black, let it dry for 10 minutes and then clear coat, or you can leave it like that and put the marker in you tackle bag or leave it in the boat and every time it chips just give it a quick touch up and keep fishing.
