Followed the instructions to the letter. Metal surface was clean, smooth & free of any solvents. Wiped it down several times with ethyl alcohol. Applied Black Magic with a Qtip as recommended and got very uneven results over the area (about 2in long & .5in wide). Repeated it 2 more times with the same result - uneven bluing. Yes, It does blueing but I can't recommend it if you want a quality appearance.