Hi, I am getting ready to store several firearms for a long periiod of time. I will only access them every 6 months or so. I am planning on putting in silica gel to the compartment, although it is not air tight. I am planning on installing a vapor retarder (Plastic) around the inside of the cavity. What should I coat the firearms in to prevent damage? Should I store them in plastic bags? Any and all opinions would be great. What about ammo? Will ammo cans with silica gel be sufficent? Thank you.