I bought my blued and black keltec about 2 months ago, and have been carrying it every day as my CCW in a fobus paddle holster.. Well the darn thing is already showing holster wear around the edges. So i found a guy in town that will put a matte nickel finish on the slide for me. He is only charging me 30 dollars. he also does the mag tubes in a high polish nickel for 10 dollars a piece. I had him do just my slide for now. i just didn't want a shinny, bright hard chrome finish. I will post pics of the finished product. And just so you know guys, he siad he wouldn't nickel plate a C9.
Even without the finish mine hasn't ever rusted, and it stays in my waistband covered in sweat for about 14 hours a day. Since it hasn't rusted yet I haven't even oiled it in over a month and still no rust at all. My P345 on the other hand, I have to oil it every time I carry it or it'll rust.