No experience with Dr. colorchip, but another similar product is called Langka leveling fluid. Either from what I understand, can give easy, good "10 foot" results.
I just arrived at a good technique to level the touch up blob, which allows using the genuine Porsche factory touch-up paint for near-perfect results. It's a bit of work, but nothing extreme... and no wet sanding. Maybe I should post a DIY on it?
Here's a teaser:
Threaded Mode
