My latest e-mail from Cole Distributing said there's a new Break-Free product suitable for long term gun storage, yet it does not need cleaning before the gun can be used. This would be worth checking out.
I usually expect serious preservatives to be like LPS-3, which protects but has a heavy brown waxy film.
I have a little bottle of clear liquid from A.G. Russell, simply marked "RustFree." The label reads: "This product will protect the metal in knives, guns or fine machinery from rust or tarnish while stored. Do not use on leather, wood, stag, bone or ivory. It is only for use on metal. contains no petroleum products."
I have used very little, mostly in knives stored on the shelf. You put a drop (or two on big knives) on the blade and spread a film with your finger. My smeller isn't working terribly well tonight, but I wonder if old A.G. is peddling fish oil. Or maybe it's silicone.
If you're curious, I'm sure everyone in the knife world knows A.G. Russell in Springdale, AR 72764. And it does say Product of U.S.A.
I use Vapor Corrosion Inhibitor bags for guns and other metal items. It sure would be cool if someone came up with a sheath that worked like a VCI bag.
"Quemadmodum gladius neminem occidit, occidentis telum est." ("A sword is never a killer, it's a tool in the killer's hands.") --Lucius Annaeus Seneca "the Younger" (ca. 4 BC-65 AD) epistulae ad Lucilium 87, c. 30