That is the OTHER kind of rust, the "good" type of iron oxide that you are trying to get when you blue a gun using the old school rust or fume bluing method or when you get a patina on a carbon steel knife. But not so good on what is supposed to be a bright shiny buffed badly, right? Non abrasive metal polishes like Flitz or Simichrome will not really remove that stuff. You will have to get a bit more aggressive,
Quote Originally Posted by xr88 View Post
So I scraped all the rust off with a razor blade. What is left underneath are black/grey spots. The spots feel completely smooth to the touch. Can I just use metal polish to get the spots off or will I absolutely have to sand?