ada stems come in anodising colours.
to anodise you need dye, sulfuric acid, a power source, about 12v i think,a few buckets and other stuff. there are kits available online but they are a few hundred dollars which would be the safest option as it can be very reactive.
Could possibly find somewhere that could anodise it for you.
the truth is nothing will keep the color on. even if you do anodize it, the paint will still come off when ever it gets hit. the only way this could work is if you somehow got a hold of magical colored aluminum, which we all know is impossible
I don't think u can get anodizing paint mister
Its done by heating it with different sorts or gases causing it to chemical react (correct me if i'm wrong)