Gnil:
I presume you do it to keep your car looking like new for the day you sell it ? If so, PPF will cost about 5k $ then CC if many layers adds 3k $ . For 8k you can repaint your whole car .
...but a repainted car could easily raise suspicions that is was involved in more serious accidents than stone chips
So if it is for resale then I guess the best is to protect the original coating.
--
2017 991.2 Carrera 4 GTS | GT Silver Metallic - The GT3 Killah!
2013 Audi S3 | Glacier White