I am not going to run this very long but I do know a little about lubricants and WD-40 may have done well in one specific test (which I doubt) however even if it did; WD-40 spray is 50% mineral spirits (basically paint thinner), 25% mineral oil and 25% propellant. That is not what I would recommend for long term rust prevention. I had hoped that they might have included Ballistol as it is what I use mostly since finally finding a source to purchase it. I would also recommend selecting a product that refers to rust prevention on firearms. WD-40 does not even call itself a lubricant much less a superior rust preventative on long term storage. It is a cleaner and water displacment product which I buy and use but not for rust prevention.