I just painted mine over the weekend.
I only had 220 grit and 320 grit available at the time.
I started out by taking some 2+2 and sprayed down the bezels due to the fact i havent washed the jeep in months...then just went to town with the 220, and then the 320 after it. Make sure everything is nice and scuffed up before priming anything. Gave them a quick wash down with cold water, then I used sandable primer from plastikote, gave both of em 1 coat let it dry and followed up with 1 coat of krylon fusion ultra flat olive green (or whichever color you prefer, black is what you said)
Let em dry and reinstall!!