I used some GHS Guitar Polish on my rosewood fretboard. I noticed some of the finish coming off when I was buffing it and this is what it looked liked about an hour after I finished cleaning it. The GHS polish says that it's safe on all woods and hardware, except untreated wood. Could this be the case with my fretboard? It's a MTD Kingston 5. I actually like the look of the fretboard with the white lines in it, but should I be concerned? Should it be coated with anything or is it safe as-is? Thanks.