Think I posted this on here someplace previously, but what I did was peeled the existing vinyl or whatever it is out of the badge, then flowed in (almost pored) some good quality enamel with the aid of a fine craft paintbrush on a level surface. No masking or anything, as if you're careful you don't need it as the paint finds it's on level if the piece is on a flat surface. Let cure for a few days, then polish with coarse then fine cutting compound. Pretty irreversible, but more hardy than a vinyl kit.