Something I read about a while back and thought was interesting was the use of a silver colored artists pencil. So off to the art store and bought a couple of them. Sharpened the tip and used an older junk model to practice on. This poor model has taken quite the abuse as a test subject. Anyway, it works pretty good. With a sharp point it allows some pretty accurate detailing. I wouldn't use it for large areas, but for some spots and areas you don't want to risk using a brush, it's ok.