JOE, WHAT ARE YOU USING TO DO YOUR WEATHERING?
Steve, I have been trying as many different methods as possible in my attempt to learn about the art of weathering. I've been using most of these Weaver items as "practice" cars as I try to settle on the method(s) that work best for me.
As for this particular car, I started with an airbrush using enamel paint washes to fade the exterior paint and to add a slight overall bit of grime. Then I used acrylic paints, Bragdon powders, pan pastels and colored pencils as needed to add all the layered weathering details. Everything is "locked-in" at the end with a light coat of Dullcote.
I'm finding so far that I like working with the Acrylic paints and Bragdon powders the best. The acrylic paint is multi-functional, as it can be dry-brushed right out of the bottle or easily thinned to a wash to add various effects.
The powders are also very universal. They can be be applied dry for more subtle effects, or mixed with a matte medium to make more of a liquid "paint". The really cool thing about the latter method is that the powders actually add a texture to the weathering, so this method works very well for doing trucks, couplers, rust and even car-loading spillage.
Thanks for asking...and hope this helps!