I'm A bit late on replies, but I'm the guy who started using graphite spray (
www.bellablades.com) for decarb and scale protection! I have test results from others posted in my papers section along with other white papers. All you need is some acetone to wipe the knives down before spraying. If you get some sheeting of the graphite it just means that you put it one heavy. It just wipes off, leaving the next layer intact. I test hardness while the graphite is still on--no difference from when I clean it off. Good luck and ignore those who haven't tried it, but speak like experts!