I have painted a couple sets of wheels black. first was my 91 toyota. Done with high temp semi gloss black. I believe brand is duplicolor.
Second was my stock rims on the Tundra. Sprayed with automotive paint SEM hot rod black.
And third was a quick job on my cheapo winter rims/tires. Again using high temp semi gloss duplicolor. Its my favorite spray paint. seems to hold up pretty good. easy to touch up, and sprays nice.
Just remember to scuff the wheels so the paint adheres to them. Red 3m scotch brite works well for this. and clean them really good. Maybe these will give you some ideas.