This will not be a good solution for tools that you use frequently, but for
long-term storage, I think it would beat anything. A device called a
"Foodsaver," which pulls a vacuum on a plastic bag, and seals it. It is
primarily intended to extend the life of foods, but it is also effective at
preventing silver from tarnishing, and I believe it would prevent rust
indefinitely under the worst of conditions. I also use it to pull a vacuum
on my photo developer in a partially full bottle, and if I stored open
bottles of wine, I would use it for that. I am not connected with the
company in any way.