One. Splotches of rust made from various shades of Forge world powders and occasional light splotches of sepia and powder mixes were applied to the model. These were then drowned with white spirits to bed them in slightly. When drying you dab the rust splotches down haphazardly. Don't forget the supports.
Three. Spray your desired metal colours onto the dried surface.
Four. Using a hard paintbrush or needle, knock and scratch the grains of sand off. This will leave the surfaces splotchy and streaky. Then purity seal the section.
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