My centre caps are in a pretty poor state. One has lost all its clips, and I've purchased a replacement, but two others have lost a good amount of paint and are looking a bit cream colored. And the other two aren't in a much better state. Has anyone repainted these? Does anyone have advice on what paint might be best suited, either for durability or for colour matching? Or is there just 'alloy wheel metallic silver' or something. Any help/advice would be much appreciated.