I spent a day or two before fitting rear drums giving them a good coat of the highest temperature paint I could lay my hands on but even then, stones and heat do take their toll in time. I painted mine principally because they're more pleasant to handle later on - likewise driveshafts (neither of which can really be seen from outside). Not much point with my front calipers as they're rusty as hell so not worth doing unless I replace them. Agree though, you need to be a bit OCD to maintain them like that.
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