Cast iron - which rotors are typically made from - is a difficult material to plate. The cast iron microstructure includes free graphite, which provides a poor surface for plating adhesion.

Plus, good luck finding shops that can cadmium plate for you.... especially in California! Cadmium (like lead) is considered a heavy metal and the EPA is providing plenty of disincentive for shops to plate cadmium.

What about using high-temperature paint... similar to what's used on engine blocks?

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95 E320 Cabriolet, 169K