Right now I'm only doing the engraving on brushed mods. I made the bit I'm doing it with and it's not quite small enough to do over a Cerakote finish yet but I'm buying one that should work so I can do that same pattern over cerakote so it will be whatever color with bright bare aluminum lines, it will be very cool. If anyone wants that engraving it's fifty bucks, I'll let you know when I have it perfected on cerakote. . . Aluminum, brass, or bronze it's good to go.