My issue with rust is if it gets at the tang and weakens it out of user sight.. I had some fine brown powdery rust come/grow out from my S6CG grip(!!) and that is kept oiled or Marine Tuff-cloth treated between uses... I did satin the blade up to the res-C though. However a clean and Kure-rust treat sorted that out and no further problems to report (I sealed the whole ricasso to grip area with Araldite epoxy glue as it sticks to metal like nothing else and is flexible too).

I wouldn't buy Yard LE personally but would home satin the bevels on a user CG Dog knife and NEVER worry about the dreaded tin worm.