S&W is using a clear coat finish on the versions that have stainless parts. Clear anodizing would hold up much better. Anodizing was used on all the blued lightweight guns. It does wear, but holds up better than paint. The best option is hard chrome plating over electroless nickel, but that costs too much for S&W to do it.
If you can strip the coating completely off just leave the aluminum without a finish. The only downside is that the raw aluminum will scratch very easily.