When i had my Gtechniq applied when the car was two years old, they first had to remove the coating that was applied by the Porsche dealership, this took an extra days labour which I had to pay for. So, I would try and get this right from day one or it will cost you more to correct later on.
I would definitely prefer the coating to be applied by a detailer rather than the dealer.
Body Care vs Gtechniq
June 2017 Macan GTS in Carmine red with 21” gloss black sport classics, GTS leather package, Air, PASM, PDLS+, pano roof, Sports Chrono, 18 way seats, BOSE, surround view, heated seats front and rear, carbon side blades and carbon interior package.
Gtechniq all day long. I applied CSL and Evo to my current 540i and 3 years on, the water still beads amazingly. My car is garaged when not in use, so that has helped reduce the wear I'm sure. The ceramic coating just makes the bodywork so much easier to clean, rinse and dry off.
Current: Macan Turbo 2021 http://www.porsche-code.com/PM513BZ5
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