For the palm rest (if u read the other post on here about that) seems to be just buildup of sweat, grease etc. from ur hand, and not fadeing paint as we all thought. I dont know who, but some guy on here noticed that the gunk comes off if u scrub it with some solution, and makes it look like brand new and he posted about it so search for that.
As for the others, unless u take appart the notebook and remove the panels, I would advise against taping things and painting with the notebook intact. you never know where the spray could go and ruin ur machine. And as far as I can tell, u only want to fix those little corners and such that are missing paint, not repainting the whole thing. U can always go to a car parts store and pick up a small touch up paint kit used on car scratches and try to fill in those spots to match the rest of the chassis.