Here is a shot of my latest work on simulating bronze propellers (most large ship propellers are not brass or gold, they are bronze). I started with the pot metal props posted in my last wip post on my B110 torpedo boat/destroyer.
After priming the props I put on a coat of Testors Copper. Then, a very thin translucent coat of Testors gloss dark Brown. Both of these were with an airbrush. Then, I did very light shading in a few areas by dry brushing Testors Olive Drab. These props are half inch diameter, and I think they do a fair job in representing cast bronze.