Golf GTI edition 30 rear or brake caliper finish deteriorated

Well, the OR caliper paint has lasted well on the rear calipers but now it's had it! Flaking off in chunks it's gonna need a refurb.
4.5 yrs seems pretty good to me.

Front s3 calipers are like the day they were put on, so ideally should get rears of to have same treatment but unlikely.