Did anyone try to paint a case in platinum grey? Is a colour code available to get an exact match of the colour as well as the gloss? What kind of chemical base of the paint would be compatible to the ABS plastic of the case (acrylic, polyurethane or else, what solvants to be used)?

The coloured Apple sign pops out easily using a pin to push gently from inside the case (there is a small hole allowing some trapped air to escape when the Apple sign is mounted). So one could paint after dismantling the machine without the need to mask any details. A good paint job could restore the original coulour without changing the texture, and would not yellow any more.

Only problem would be the writing of the Mac's nameplate. This could be fixed with a laser cut sticker on transfer film. The result would not be the original, not rising the value from a collectors point of view, however.