I put my firearms in sack-ups, and then seal each one in a U-Line VCI poly bag. There's so much Vapor Corrosion Inhibitor material in my gun safe, that I've never worried about the few firearms (stainless) that aren't sealed in the VCI stuff. Also keeps guns from banging into each other when rummaging around in there (way overfilled gun safe). Then to top it off, have a couple of the cheap Remington rechargeable dehumidifiers in there too. Rust.....no worries.