642-1 Pro Finish
My finish wore badly in the first 11 months I owned it. I called S&W and sent it in. It came back looking like new. Because I had read about this on THR, I promptly waxed it and was careful about using solvents around the 'waxed' areas. I continued to carry it, (a lot) and after another year, it still looks new. I don't know if they used a different process the second time around or what, but, the second finish is holding up far better than the first ever did, (might be the wax?).
I also used the finger nail polish tip. Bright orange, applied several times carefully and it doesn't look cheap. Had a guy at the range ask me where I bought the sight!! It's not a safe queen, it's a carry piece, but, that doesn't mean I want it to look like some butt ugly Tactical Tupperware shooting appliance either, IMHO.