I hope you enjoy your GT4 for many years and your PPF performs up to and above your expectations for your entire ownership experience!
Our BS has now had XPEL PPF (full frontal, rockers, rear bumper) and Fusion Plus Ceramic Coating (entire car, including wheels & calipers) for 3 months/900 miles (Covid19).
I was concerned that PPF would dull the radiance of our Sapphire Blue Metallic paint, but not so far. Perhaps the ceramic coating deserves some (or much) of the credit for allowing the paint color to shine through, as if there was no PPF. I'm still somewhat apprehensive about wear over time (yellowing, orange peel, etc.). Regardless, it has already paid dividends preventing rock chips I was certain had occurred, but did not. In addition, our garage is fairly crammed (2 cars, a golf cart, and chest freezer) and I often brush up against the back bumper to charge the golf cart, but still no scratches.
Am curious how easy washing and drying will be, especially with our new Master Blaster Air Force Revolution...just haven't had to yet.
Chose XPEL because their US corporate office is ~40 miles from here. More Important, during the pre-installation visit, I figured the owners of the 20+ high end cars (Porsches, Ferraris, Lambos, McLarens, AMGs, etc.) under their roof chose THIS shop and XPEL for a good reason. The shop foreman indicated they receive a steady stream of high end cars shipped to them for PPF application from all over the country, although mostly from our five state region.
My understanding from others is most PPF products are similar with only subtle differences and that product installation is the key critical component. I have no allegiance to XPEL or their proprietary ceramic coating and would have gone with 3M Scotchguard or SunTek, had I lived near one of their corporate offices having a similar high quality installation reputation.
I plan on keeping our BS for life or at least 10+ years, whichever occurs first. Thus, stay tuned for an annual wear update, provided I haven't shuffled off this mortal coil.
Full disclosure, I am a retired banker and have/had no affiliation in any way (manufacturing, marketing, installation, financing, etc.) with any of the aforementioned products or services.