I make a lot of painted picture frames for ebay customers. Flat black krylon works the best, Rustolum runs too much. I spray metal, plastic, and wood frames. Take your time. Spray a thin coat of flat black and let dry for 20-30 minutes. Spray another thin coat and let that dry. Then if you want a glossier black, spray that on, but use flat black first.
Three fairly light coats shoulld do the job, and if the paint gets scratched up, steel wool and repaiint.
I think gold footers would also look cool with black, gold krylon is one of the easiest to use.