If you want a quality set of stripes on your expensive laptop, I'd definitely find a painter willing to do it.  Tops are easy to do.  Metal needs a self etch primer, not a regular primer.  A regular primer will flake off easy.

Only clear over the stripes, not the rest as to preserve the original finish.....that is, unless you want the entire top glossy. 

On the other hand, if you took it to someone who knows how to paint, they'd use the proper automotive paint and not rattle can.
_________________________
http://www.computer-choppers.com