Production errors causing paint problems

Hello together, drive a Phaeton model 2006 and have only problems with the paint. So far it has been painted four times including new doors and tailgate. The last time he was even driven to Dresden in the glass manufactory. Although everything is on cull, but damn annoying. As a plant two sides from the added court TPI, in which is precisely listed, what this is for a production error, what measures have to be taken and how the culant is regulated. Can also gladly all S the TPI.