IMO Black is a bad choice of colors...Will be very hard to tell if one side has more brake dust than other side. Not that is matters much but an indicator of brakes. Any grease that leaks out of dust cover, won't be able to tell till many miles later. And you do know the first time you torque lug nuts, say good by to your paint job?
Having said that...Krylon paint is my paint of choice. Also last couple years they now have a clear gloss "UV Protection" paint. Product number 2444 or sku# 7 24504244400 How much "UV protection" not sure but I've got 3 years on fridge/freezer vent. And the stove vent I only used the paint, as a test. Three years into it now and beginning to tell the difference, but not much yet.
https://www.amazon.com/Krylon-2444-Fusion-Plastic-Clear/dp/B001TNMWBM