Primer may not be necessary unless there is bare metal involved or you need to fill minor imperfections but any good epoxy primer would hold up. I use single stage polyurethane paint. If it looks too shiny then use it a while. The shine will decrease with use.
I'd avoid putting on too many coats. It adds up pretty quick and makes the wheel grow.
I used a two component primer. Then came the 2-component epoxy paint that is also used in this country for trucks. The result is still good after 1 year.
Wipe it down with a good paint prep or rubbing alcohol before painting. I did not use a primer and was happy with the results of using Black VHT engine paint... Chap
I've had decent luck with acrylic lacquer . The cracks eventually come back , no matter what I use for a filler . For a good job , I've found it best to go ahead and replace the steering wheel with a new repro steering wheel .
I repaired the broken, missing and cracked parts w/bondo, sanded, wiped it down w/alcohol and sprayed it with rattle can enamel. Looks good to my old eyes.
I’ve used devcon epoxy for cracks and minor voids
Then used a two part paint
Actually DP 90 will work some like a glossy finish...I don’t
Clean it well whatever u use
It would help if you mentioned which steering wheel you have. I have repaired red '28 wheels by filling cracks with Super Glue and fine dust from another red wheel. After that, I simply sanded the wheel and polished it with brown shoe polish.