My friend has a browning a bolt stainless steel with a Zeiss on it and don't want very much for it bc he left it In a room that was very humid I guess and when he came back a long time later it has started rusting. It has a pretty big spot on the bolt and another place or two. Does anyone know if you can get someone to sand the rust spots down And recoat it with maybe duracoat or something? And how much do y'all think this would cost?