Let's help a Sprintstars friend

Hi guys, I received this help request from an italian friends. Please read it and if you know a possible answer, help him. Thanks:


hello guys, I'm Davide and I'm restoring my '71 dune buggy. I found these Empi by Lemmerz sprintstar wheel, 2 in 15x5,5 and 2 in 15x8, to put on my buggy.
I'd like to color the inside in black as the original style. Which kind of black I have to use? Do you suggest to start painting black and after to paint it gray again?
Thanks a lot,
Davide