Weathering time: gave the boots and one of the side pouches a try...
On the left the clean version. I used a mixture of yellow and brown acryl and a lot of water. Also black acryl and water for a "dirty-wash", brushing the colour onto the surface. I repeat it till it gets darker and darker. I also used black shoe cream to darken the middle front part of the boots.
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Here both boots weathered:
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The side pouches:
Both still clean.
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I used the same colour mixture.
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Side-by-side comparision: left clean, right dirty.
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So, this was the first step. I thing I´ll do it much more "heavy-weathered", in little steps. Even thinking about using rattle can spray. Trying to find some black primer in my local store. I read about this in one of the older threads and think this is a great idea, because it seems to be not so "dark" like using pure black spray.