I have some range brass picked up from an outdoor range which is discolored from exposure to the weather. It cleaned up somewhat with a 5 hour tumble with walnut media, but some is still tarnished. I have a bottle of Dillon Rapid Polish that I have not used before and was wondering if there are downsides to using brass polish in the media. Does it weaken or change the brass at all? Any reason I should not tumble again with some polish in the media? Thanks for the input. rube Wanna kill these ads? We can help!