I broke out the washes and the chalk pastels to do some weathering. The wash is a mix of GW Devlan Mud and Badab Black. I put a wash in the creases and panel lines, then hit it with a hair dryer.
THEN....on to the redneck weathering powders. Chalk pastels. I keep meaning to invest in some weathering powders, I really do. But, I've used regular artist's pastels for 20 odd years. The same set of pastels, as a matter of fact, bought in my college bookstore when I was a freshman in 1989. I have a flat brush (2/0) set aside and taped to the box that I only use for pastels. Run the brush on the chalk, pick up some pigment and apply.
After a liberal dose of brown, some black, orange for rusty areas and even some grey and purple, here ae the results.