RCS, if you get some petroleum jelly ( Vaseline over here and I think it's the same in the US ) and coat the blade/edge it prevents rust, is none toxic and when you want to light a fire rub a cotton wool ball over the blade and clean the vaseline off and you have a great bit of tinder as it burns well....

This works well for all tool steels and the so called stainless...which can also rust.

Rust on weapons and knives does'nt happen if you take these sort of preventative steps...