After undercoating your model with either Chaos Black or Skull White, basecoat the armour with Mechrite Red.

To dirty it up a little, paint a watered-down coat of Black Ink over the all the armour.

Leaving some of the area darkened by the ink showing, paint over the armour with a 1:1 mix of Mechrite Red and Blood Red.

Highlight the armour with straight Blood Red.

For the final highlight, use Blazing Orange.

Use Fiery Orange to paint some flames or other symbols on the armour.

Highlight the Fiery Orange with Golden Yellow.