- Jan 4, 2014
I just got a Cruwear PM2 (not the micarta version) and I'm excited to see how it performs. Kudos to Spyderco for releasing production models in these great steels.
Cruwear and K390 are both carbon steels that will patina, maybe rust, under certain conditions. They are pretty far off in terms of performance- Cruwear is prioritized for toughness but is not the best for edgeholding, K390 is prioritized for edge holding but isn't very tough. I think the properties of Cruwear are good for the PM2. I've read of several people who have broken blades in S110V and Maxamet- they would be better off with Cruwear.
When people say "give it a patina to protect against corrosion", that's a really vague statement. You can use a chemical agent or vinegar to promote the formation of black oxide on the blade surface, which is a stable oxide that gives a little bit of protection from rust (red oxide) to the steel underneath. Some "patinas" are not black oxide but just mild forms of oxidation that are not really protective.