I made a second custom infected/rusty this time the base mask was a silver Miru.
This one was created a bit different then the last one here the steps:
1.Paint the mask black with acrylic paint
2.Before it dries wash of some of the paint
3.After it is dry mix rust particles with clear acrylic paint before painting
4.Paint the mask with the mixed paint
5.Then the mask was sanded after the paint was dried
More pictures with a white back round:
Mask on the statue from the barraki promo:
Before and after painting:
Under different lighting conditions:
Compared to the last mask:
Gif to show some of the reflections:
I used the extra rust paint mix on this black ccbs part: