I wish I could just bare the metal. But the prop is a mash-up of steel, brass, aluminum, styrene, SLS, and Apoxie. I've been giving it opaque primer, and a paint treatment on top of that.
The look I'm after is 1930's blue-ing with wear mostly on the bearing surfaces. It's a made-up pulp era hand cannon, and will be mostly a display prop. The graphite-based technique is looking great on the blued surfaces. The breech cover faces, though, which are briefly exposed when the gun is opened for re-loading, are giving me some trouble.