Spring Cleaning the Wasteland
A closer look at the method
Prime in black then a coat of burnt umber. Then spray on a base colour in a zenithal kind of way to allow the burnt umber to shade. On the cars I sprayed the centre of the panels as opposed to zenithal:
Sponge on some weathering
Spray over all the good work so far with Streaking Grime. It’s an enamel wash so is not water soluble. Wear a mask when spraying and clean the airbrush by flushing through white spirit. 
Using a rag, makeup sponge or similar, dab white white spirit to remove it from flat areas or anywhere that should be either clean or highlighted. You’re basically just leaving it in the recesses as a form of weathering but this technique really allows control over where the grime goes. With white spirit you can manipulate the affect for ages. None of this quick drying patchy mess you get with acrylic washes! You can apply more as needed and use a synthetic brush with white spirits to hone the details. The following gallery shows the same effect on the smaller pieces. Exactly the same process but you’ll see I quickly painted a few of the (necessary) details, and I used a paintbrush here and there to be more careful where the white spirit went. Otherwise exactly the same.
You’ll notice on the metallic items the grime is greener. That is because I used Winter Grime from the same range as Streaking Grime from AK interactive. They came in a set so I wanted to try it. I think I might like it more for Fallout actually as when you play the video game there is a definite green hue to the wasteland.
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