The bases were first painted with Adeptus Battlegrey.
Washed all over with Nuln Oil,
Dry Brushed with Adeptus Battlegrey
Then Dry Brushed with Codex Grey
Then Dry Brush with Fortress Grey
And finally a light Dry Brush with Dheneb Stone
So was the base colour done by hand or using an airbrush?
Done by hand, I find you have much more control with where the paint goes