Nothing, I like the look of a well used, patina blade. Rust shouldn't be a problem if it stays dry, and if it ever gets real bad, back to the sander for a quick polish.
yea... i figured patina i been thinking about it on a couple users... but i am not to sure how to do it and how it reacts with the 77 and 101... but i live in a humid place.... if i dont clean my safe stuff every month it will rust...