I was a little hesitant to get a ZDP-189 blade but man am I happy that I did. I was worried about corrosion and difficulty in sharpening issues. Both are really overblown IMO. I got a CF Spyderco Stretch and put a new mirror edge on and it wasn't nearly as hard as I thought it would be. I used the heck out of it in my EDC and it will still shave the hair right off my arm. As for corrosion issue it will stain and form a patina or darken. But not rust like some claim. The patina is actually a good thing as it will form a protective barrier against rust. You can see this darkening in these pics. I did nothing to protect this blade just wiped it off after use. I cut everything from food to cardboard to zip ties. I have no chipping issues either. (Image removed from quote.)(Image removed from quote.)
What do you use to sharpen this?