My calipers are looking pretty brown.... track days does that to ya. At some point I would like to get them rebuilt and refinished. But how to prevent them from discoloring again? For a reasonable cost, can I have them anodized? Nickel-plated? And would that prevent future discoloration? I don't mind doing them in a different color, like this Brembo GTR caliper, which I think is nickel-plated.