Another WIP of the base for my mech model.
'Metal' pieces sprayed with a dark metallic spray paint, masked off again randomly, so only patches of metallic paint are still visible and sprayed with consecutive layers of red primer, orange paint, grey paint, then white paint. Successive layers were misted on, instead of a thick layer.
Rust effect then created by thinly layering up red/dark brown/light brown/orange/tan paint