DJ I think the watch gets scratched which I’m madhandling my children’s bike into the car or when doing some DIY.
Lab markers/tape solve most life issues I’ve found.
edit: nope, after a weekend of collar-shirt wear, ie with storing cuffs, all of the aluminium is bare again. I think the watch continuously rubs (I’m right handed and wear the watch on my left wrist) on my shirt cuffs and wears the paint off, It seems. I wear shirts with cuffs 24/7 unless in bed or at the gym, and roll up the sleeves in the summer. It seems this wears the paint/powdercoat off quickly (1 month) and only in the locations shown.