Citadel Zandri Dust Base paint is designed to give a smooth, solid light brown color over an undercoat and for that reason this will almost always be the first paint you use on a miniature. Shake the light brown paint before using (you can make this easier by adding an agitator ball).
The light brown paint can be a bit thick sometimes and then you just add a few drops of water on your pallet. You really don't need a lot of water. Something to watch out for is to make sure you don't apply too much paint so that you don't start hiding details.
Another important functionality of this light brown paint is that it not only covers the undercoat, but also covers other colors. So if you later miss something about this color, you can easily paint over it with this Zandri Dust base paint.
The color of Citadel Zandri Dust (21-16) is similar to: Old Citadel Kommando Khaki; Vallejo Game Color Khaki (72061); Vallejo Model Color G. Cam.Beige (70821); Instar Golden Brown; Reaper Master Terran Khaki (9122); Scale75 Thar Brown Matt.