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Try turning down the psi on your compressor (if you are using one). Experiment with thinning the paint down further than the 1/3: 2/3 ratio. I would start with the base ratio of thinned paint, and add thinner a drop or two at a time (directly into the color cup). double action airbrushes are more expensive, and harder to maintain, but the results are much better. With the right amount of practice, amazing results can be achieved. When I am trying for a decent amount of road grime (or dust/ mud) I position whatever I am painting at about a 45 degree angle from my airbrush (or vice versa) rolling stock (and armor...I also do much tanky stuff) flip the model upside down, hold at 45 degrees and spray. This way, the majority of paint collects on the bottom of the model, and you get an overspray on the sides. HTH[tup]
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