You'll need a dual action airbrush. I used old
GW foundation paints a lot - I'll put what I'd use now:
The terminators:
Black undercoat,
Zenithal progression (see
http://www.winterdyne.co.uk/maz/winterdyne_tutorial1.pdf):
Khemri Brown (VMA Hemp)
Dheneb Stone (VMA Sand Yellow then VMA Sand)
VMA Ivory.
Devlan Mud directed washes (Agrax Earthshade)
Re-highlight with Ivory (use glaze medium to soften this in).
The Land Raider:
White or light grey primer.
Preshade panel lines (practice your thin lines with the airbrush) and edges (yes, you -shade- edges) with a dark brown (I think I used VMC Leather Brown).
Numerous very thin coats of Khaki (or a VMA Sand Yellow. Build up by adding Ivory to the mix and working toward centres of panels.
Drybrush very lightly with ivory (this picks out the shaded edges and gives them a sharp look).
Here's the original
WIP thread:
http://forums.relicnews.com/showthread.php?233692-Deathwing-commission&highlight=winterdyne+deathwing
One of the first commissions I actually did, just after going full time on it.