Birchwood casey flat black touch-up felt pen - Birchwood Casey Universal Touch-Up Pen

I bought it to touch up some tiny marks and chips on aluminum/alloys used on Sig, Kimber and similar frames. I also touched up some Mossberg 930 and 935 and similar barrels. It dries to a flat black. The first coat was not a real deep black, so where I needed the deeper black, I waited an hour and applied another coat and the black did deepen in color. Since the touch-ups I've shot the guns and got the barrels hot and cleaned the guns with solvents and oils. The touch-ups have held up! Make sure to clean the bare metal spots to assure proper adhesion. My only complaint is that the felt tip could have been a little finer for hairline scratches, the tip on the pen is about equal to most "medium " felt tips.