WN GP7 #102
The rust on the top of the carbody was done using cosmetic sponges dipped
into various shades of rust colored artist oils. After removing most of
the paint from the sponges by blotting on a paper towel, the sponges were
dabbed onto the model going from lighter shades to dark shades. This is
a fairly easy technique to achieve a random, pitted look to rust on a area.