I have an appointment to have Opti-Coat put on by Joe at Orinda Auto detail next week. Seems like a lot of northern California Model S owners have gone there. He says that I should have the Opti-Coat put on top of my existing paint protective film. My car has film applied by Premier Protective Films in Fremont. They use film manufactured by Prestige Film Technologies. Should I go ahead and do this? What are people's experiences with Opti-Coat over film? Anyone have direct experience with this combination of manufacturers? Thanks in advance.