Yep, I've painted a few of them. Just clean it with some soapy water or solvent to get the grease off of it first. I used an acrylic lacquer which had pretty decent adhesion...just don't pick at it /images/boards/smilies/wink.gif An enamel would most likely have excellent adhesion.
On a side note, my days of painting them are over after a coworker was kind enough to make me some vinyl decals after I helped his son win their derby last year
Its actually on old SS...my first one with fenders and last one using the tungsten rounds. I wish it were faster, since it is so pretty /images/boards/smilies/smile.gif
W...I don't think they are any more difficult to paint than steel. I just wouldn't expect 100% adhesion with lacquers. I've been using vinyl over them since its easier to change the look of them...small pieces of fake carbon fiber vinyl are only a few $ on ebay.