From doing dressing and crowning, very similarly to Alan's method . . . . herewith the MiJ Squier frets:
before...

After . . (the dull ones have only been filed, before sanding and buffing. . . )

Had to do all 21 frets ! Glad it didn't have 22! ?

I made a little jig with a concave slot, for sandpapering and buffing, . . it worked great. ?