Ignore the fact that I tested this on an Imperial Guard walker...

Armour

1. Prime Black
2. Zenithal Bold Titanium White (lower PSI)
3. Base Space Wolves Grey
4. Highlight Fenrisian Grey

Yellow

1. Base Averland Sunset
2. Layer Flash Gitz Yellow 1 : 1 Averland Sunset

Red

1. Base Wazdakka Red
2. Layer Evil Sunz Scarlet

Black Metal

1. Base Black Templar
2. Edge Gunmetal
3. Shade Nuln Oil

Gun Metal

1. Base Gunmetal
2. Shade Nuln Oil

Barrel

1. Shade end Druchii Violet
2. Shade thinned Druchii Violet

Aquila

1. Base Zandri Dust
2. Shade Agrax Earthshade
3. Layer Ushabti Bone
4. Layer Screaming Skull

Lens

1. Base Wazdakka Red
2. Shade Reikland Fleshshade
3. Layer Evil Sunz Scarlet
4. Dot Bold Titanium White

Plasma

1. Base Bold Titanium White
2. Airbush Troll Slayer Orange
3. Recess Bold Titanium White
4. Edge Jokaero Orange 1 : 1 Evil Sunz Scarlet

Weathering

1. Sponge Dark Reaper 1 : 1 Fenrisian Grey
2. Sponge Wyldwood
3. Edge Wyldwood
4. Rivets and Streaks Agrax Earthshade

Base

1. Base Doombull Brown
2. Shade Reikland Fleshshade
3. Recess Agrax Earthshade
4. Drybrush Knight-questor Flesh
5. Drybrush Karak Stone