I get that argument if I just had it done. 12 years sitting in the driveway ive had to replace 2 sets of headlights due to clouding/yellowing from the sun. My white linex is still white. I think 12 years is enough testament.
For it to be properly done you will need the paint corrected and coated. Then the legit ppf applied. If its done properly then the ppf can be easily removed by a professional and reapplied. Lifespan depending on conditions. Once ppf is yellow or cracked then its up to the warranty with ppf and...