I dremmeled some damage into the helmets and added some acrylic brown and sand paint where I thought dirt would build up.
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A couple of rounds of adding grime and removing grime with isopropyl alcohol until I was happy with the result and then I added some overspray with Montana Sahara Beige, building up heavy in areas that were more exposed. I added a few random brush strokes and paint splatter with a tooth brush and sealed everything with clear matte varnish.
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This was a quick build, the lenses were done in an evening and paint work was a couple of hours.