the rat rod idea works....maybe do the like auto guys do with clear over patina. see if you can get a can of catalyzed clear )rattle can with a bulb on the bottom you push to start he catalyzation process) from an auto paint shop an use that for a top/preservative coat. Just saw a lowered 56 or so GMC pick up with that type of finish (and flowers and other designs painted on the bed....didn't get a pic