I sampled one of Bragdon's best selling weathering powder kits, a four pack of light, medium and dark rust plus soot. The manufacturer states that his materials are not chalk--they're actually a very finely ground mix of real rust and other weathering ingredients plus a powdered dry adhesive. The powder goes a long way and is pressure sensitive, adhering to most non glossy materials when scrubbed in with a small brush. No sealing is necessary! The powder comes in a wide variey of colors and gives a dry sooty appearance as depicted in the rooftop photo below.
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