I have started to use TRW discs that are pre-painted black (except for the brake surfaces).
Because I live right next to the beach, disc corrosion is a major problem for me and the back ones only last a couple of years due to the build-up of corrosion. For some reason, the rear discs never really seem to clear themselves of the rust dust and you get an embedded skin of corrosion.
My wife's car (VW Passat) does not seem to suffer from this and the discs are always clean and bright.
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