Citadel Daemonette Hide Base Paint is designed to give a smooth, solid purple color over an undercoat and for that reason this will almost always be the first paint you use on a miniature. Shake the purple paint before using (you can make this easier by adding an agitator ball).
The purple 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 to hide details.
Another important functionality of this purple 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 Daemonette Hide base paint.
The color of Citadel Daemonette Hide (21-06) is similar to: Old Citadel Hormagaunt Purple; Vallejo Game Color Heavy Violet (72142); Vallejo Model Color Violet (70960); Instar Light Purple; Reaper Master Nightshade Purple (9022); Scale75 Violet Blue Matt.