One of my favorite weathering wins was an old 40’ boxcar I faded with a light acrylic wash, then added grime streaks using artist oils. The trick that surprised me? Using a soft makeup sponge for vertical streaking—it blended the pigments way better than a brush. Totally looked like it had been sitting in a yard since the ’70s!
On the flip side, I once tried a “salt chipping” rust technique on a tank car… and let’s just say it ended up looking more like a moldy pumpkin than rusted steel. Lesson learned: less is more!
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