If there's multiple scratches on the black coating of a fenix to the point that you can see the shiny metal color underneath, is there any way to quickly repair this? I've heard of using a sharpie but have also heard that it doesn't last very long. Some have mentioned other types of permanent markers such as acrylic markers, nail polish, or Birchwood Casey. With Birchwood Casey I do have experience, although on aluminum, and not only did it feel sticky to the touch, but it wore off pretty quickly just from touching it.
