Armour Base

1. Prime Hyrax Brown
2. Using a sponge (and a bit of overbrushing in hard-to-reach areas), coat the majority of the model with Gargoyle Grey
3. Sponge Brainmatter Beige over the model, being more selective and choosing the surfaces which would be hit by light.
4. Sponge Matt White , focusing on the volumetric/upward-facing surfaces.

Block in Details

1. Coat any tech/mechanical parts with Black Templar
2. Visors/helmets/etc with Old Copper . Going for a NASA-style here.
3. Leather with AK Waffen Red-Brown