Alrighty, back for a little post on some Tamiya Weathering powder. This is my process.
Using only the Snow/Soot/Rust kit on this car, after painting the base with Vallejo Black.
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I start by dulling the whole car with some of the Soot powder, to slightly fade the decals and remove the shine from the car. The last two panels to the right haven't been hit yet, so you can spot the difference.
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Followed by rust highlights with the Rust powder.
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Followed by some running white paint, using the Snow powder. I use a toothpick, roll and cake the white powder to the tip of the toothpick. Lay it down flat against the car over the decals. You can roll it side to side, or pull down while applying pressure, or both. Follow it with light down-strokes with the brush.
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Final pic in next post.
-RC