These drums have been on a 2001 Corolla for 4 months, with frequent frosts and very salty roads. So far I've only noticed slight rust film on the edge of the drum and on the uncoated surface, that's a day and night difference to the peeled originals. I haven't noticed any noticeable effect on braking performance, although there is now no warping/pulsing from the old drums that wobbled a bit. At least it's now easier to remove the wheels.