Well I did it: against everyoneâ€™s advice and my best judgment, I cold blued my 28 year old shotgun. The barrel had a large spot of rust and a line of rust about 10 inches long under the stock, so something needed to be done. I spent about 3 hours polishing the metal to a mirror finish then used Birchwood Casey Super Blue to color it. You know what? Surprisingly it came out good, not great but good. The finish is not quite as dark as the factory blue on my Ruger, but I was able to get a nice even coat without streaking the finish. I think Iâ€™ll re-blue the barrel on my Hi-Point now.