I have found that rubber layer seems to hold finger oil stains very well: they are difficult to remove except with isopropyl alcohol (which I know shouldn't be used on rubbers, as it dries it out). I don't recommend putting anything on there unless you intend it to be permanent. I would never but only because I really love the all matte-black "stealth" look of the unit! Shallow, eh?
🙂
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G74SX-CST1-CBIL, i7 2630QM 2GHz
32GB DDR3 RAM @1333MHz
GTX560M 3GB DDR5 (192 bit)
17.3" LED 1920x1080
Sentelic TP, BIOS 203
Debian Linux Wheezy (Testing) Kernel 3.2, NVIDIA 295.40