I'm getting ready to strip down an old High Standard Double Nine. It's a 1967 model. The frame is aluminum, and the cylinder and barrel are blued steel. Question: Has anyone tried Birchwood Casey products, such as the Liquid Gun Blue and Aluminum Black? And do they work? Or do you know of something better to use that is simple? I've already brought the grips back to life. It's an accurate straight shooter, but I'm not going to spend a fortune on this one. Thanks for any ideas and help.