Painting adds a lot of value to the machine, but not as much as good preventative maintenance. When our machines go in for paint, they also get everything else done that is needed, may it be an oil change or filters, etc. The guy that repaints our machines does a top notch job, though I'm not sure if we use Cat paint or not... all the machines that get repainted get sandblasted first, and the yellows tend to be really close, but not quite cat.... as you can see by the photo with two D8's...
And here is one of our older A30c's after it's paint job... the 8 behind it was next in line.
-Jim