LOL, this thread is like pulling teeth!
Here's a few hints for useful info:
1) Metal composition
2) Metal coating- paint, anodized, rust, etc?
3) Thickness
4) Depth of scratches/cuts/blemishes/etc
5) Relative flatness needed (how flat is mating surface)?
6) What is the purpose of "better contact with other surfaces".
7) Assume any other info you have, IS relevant.
8) For Pete's sake man, just spit it out, what EXACTLY are you tryin' to do?
Random guess would be to put it up against a belt sander for 10 seconds but without the above info that may not be appropriate... If all you want to do is keep it from scratching your desk then get some rubber feet for it.