airbrush lighter silvers to build brightness. Ironbreaker Runefang Steel
Airbrush Calth Blue (CLEAR) into the recesses, this is where the red will be darker
Airbrush Mortarion Green (CLEAR) into the deepest recesses. This will become almost black under the red layer
It's important that the shading is tidy before the red goes on, as splashes of either the green or blue will look quite messy after. It's worth taking the time to get it right
Airbrush Angron Red (CLEAR) all over the model. This may need two or three coats to build the intensity of the red.