The process I used for mine was...
1. First layer of primer.
2. Second full layer of Hammered Metal Paint. This gives the helmet/armor the look of hammered metal versus smooth, dirty chrome. It pays off on the next step.
3. Black acrylic paint that is dried for a few seconds and wiped horizontally across the mask. The black paint stays in any grooves and imperfections and gives it the dirty look. You can wipe off as much as you want, and if you mess up, just add water and wipe away.
4. Once satisfied with the look you want, I always "finish" the piece with a nice layer of Clear Coat paint. This not only gets away from the painted look and protects the paint from elements, it gives the dirt an "oily" appearance which I liked better than just paint.
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I used this technique with my armor as well. I got alot of response to the paint job when I informed them my armor was made out of foam...
And again used on the resin plasma cannon...
Hope this helps.
