Alan, not sure about dr martin's quality compared to others. I mainly like tgat it cones in a set with lots of color choices. I think that once you start using powders you will resist using paints for most typical weathering spplications. I'm still going to aurbrush the light coatings of dirt and dust on the car's bottoms, but use powders for the streaking and rust stains. Any areas of concentrated rust will be started usung heavier coats of artist tube acrylics, burnt and raw umber. This builds up some rough texture like heavy rust can do. If you look way back when I built the bridges you'll see how I did this. My Thrall all-door car is an example of WHAT NOT TO DO in freight car weathering. I tried using "dry brush" for tgat, but was way too heavy.
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