Well. However, I had to get the FLAT BLACK XF-1 and mix it into the GERMAN GREY XF-63. The ratio was ~ two part flat black to ~ eight part grey to make it work. If I had the time, I would also add glossy black 1 part, flat black 1 part and German grey 8 part to the texture to be better. But the XF-1 / XF -63 was good enough - you can't tell from a distance about 3'.
The small bottles are not full so you can add them into the grey bottle.
Let me know how it works out for you.