Theuns I've never got realistic exhaust staining on 1/48 or bigger with pastels. That may say more about me than the technique! I airbrush thinned paint in the area I want to stain. I use thin layers of umber,black and sometimes grey. I often see exhaust stains in the wrong place,it's important to find a decent reference if you can,the airflow causes staining in surprising patterns on some aircraft,certainly not a straight line to the rear of the exhausts.Look at this humble Hurricane.
Cheers
Steve
Cheers
Steve
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