Anyone have any ideas on repainting the black portion on the rally cap? How about taping off the top and bottom, spraying the painted portion and using a scotch brite to take the paint off the center ribs?
Try this one on for size. As soon as you paint them, dip Q-tips in thinner and wring them out by rolling them on a paper towel or rag. Next very carefully run the Q-tips along each rib. This will take a very steady hand. It would probably be a good idea to have the caps clamped down or held still somehow to make it a little more steady.
I was shown this trick for use with the interior center shifter area of the console. It seems like it would work for the center caps too.