i recently was looking for paint to repaint a 99 year old brass steam gage face after final polishing. what i just got last night was this
http://www.sharpie.com/enUS/Pages/oil-based-paint-marker.aspx in medium, fine and extra fine. it is an oil based paint. i had to do an immediate test when i got home and was smiling ever since because it will work for what i want to do. so if your satisfied with the colors available dont worry about removing the existing paint especially if the tag is stamped. just fill it in with the extra fine pen and then after it the paint flashes or just about dry go over it lightly with a q-tip with some thinner on it to clean it up. i know they make lacquer pens also but havent found them.