So after seeing other threads and wanting to try it, I lightly sanded one of my trumpets and it didn't mess up. The only thing is, I want to restore it back to the way it was. It's a Bach TR300 silver tumpet and its just lightly sanded to get rid of the shiny finish. Is there a cheap way to fix this or do I need to relacquer or replate it? Getting a new one isn't an option because I have to keep this, I just need to know what to do to make it "shiny" again.