Two products come to mind with regards to touch-up repairs:
Langka and Touchup123. Google them for more info. I have seen many enjoy the product, but I will be honest...I have yet to try it but I think I will very shortly. Basically after applying ANY form of touch-up paint, whether from the two companies mentioned above or from anywhere else, it is best to level the touch-up paint with a polish (or compound if necessary), then a finishing polish to restore shine. Wet sanding down a touch-up paint "blob" is even better. But you should follow up with a proper polish as well to restore shine to the area being wet sanded.