Its good that actual info vs hearsay is being spoken. userd1402 is correct, a lazy incompetent skimped on his job causing irreparable damage to one of the original guns AFTER they were torn down, modified and rebuilt. The finish was nearly removed and left in the mould. In an attempt to hide this he simply asked the painter to modify the other to match along with the castings. The paint used was really just rattle can stuff out of an airbrush with the brown age effect being various tones of Mohawk rattle can wood toner again applied by an airbrush. One trick used for both gold and brass many times is the same color being an old version of rattle can brass paint. I still have some cans in the garage ill dig out and snap a pic. I can only speak for the Serenity film..