I had mine done at Autofficina a few years ago. I am struggling to remember, but I do recall that they were very adamant that they knew exactly what to do to restore them to originality. I *think* it was paint.
Not sure if this helps very much, but you could give them a ring?
Thinking of getting my Diablo 6.0 wheels done at Lepsons. I will ask them how they are planning on doing them. Going for a dark grey / black titanium to match the carbon rear wing.
