I spent Tuesday night and yesterday afternoon applying a sequence of oil washes to my panther. I started with a very thin wash of black, applied to the entire vehicle. Once the wash was almost dry, I started laying down some pin washes of burnt umber (for grime) and Indian red (for rust).
You can see that I got some pooling of the pin washes. I'll attack those tonight with a little thinner. That engine deck really pops now.
Here's a good shot showing how the black wash actually stained the acrylic paint. compare the paint tones here with those in the previous post.