Reddit mentions of AMACO - Rub 'n Buff Wax Metallic Finish, Pewter, (0.5-Fluid Ounce) (2-Pack)

One of the things I'd say is that to get real nice effects that look good in person, it pays to use different media, not just colors of paint. I like Rub n' Buff paste for metal, as you can apply it very very lightly on prominent edges with a dry brush and gradually build up the wear, and you can buff it to a high metallic sheen.

For gunmetal or carbon build-up, graphite powder is excellent, although it never dries, since it's already dry, and isn't great for handling. A little spray fix is good for that.

An overall wash with very thinned acryllics, which you then wipe off, gives good overall staining, then some pastel powder of various earth tones in a couple spots, especially on the feet.


Overall, don't just slap stuff everywhere. The key to it looking right is to do techniques where they'd show up in real life. More intense "dirt" washing at the bottom. Bare metal on salient edges and moving edges. "Oil" near mechanical parts, etc.