I prefer weathering in guns. The black with the silver showing through on the edges looks great. On a mask though, it looks old and neglected in it's current state.

What i would do to get the weathering to look like it does on a gun, is to re-paint the mask and start the process again, but don't go all out on it. Rub the whole thing back and start with a grey or white undercoat. Give it about 5 or 6 light coats of the grey/white to get an even distribution of paint. Leave it for at least 24 hours to cure/dry properly. Once the undercoat has dried, start on the top coat. If I were doing it, i'd go for black or OD green. Give the mask about 4 or 5 light coats of the top colour to make sure you get even coverage. Don't spray it on too thick or you'll get runs. It's better to do lots of thin coats than a few thick coats. You'll get a better result.

So once your mask is completely dry, you can start on the weathering. I'd use ultra-fine sandpaper. You want to rub very lightly on all the corners and edges, just enough to rub through the top coat and expose the base coat underneath. But just on the corners and edges, otherwise it'll just end up looking old and trashed.

If you need reference, check out the post that MCH is talking about here.

Go for it.

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