Skip to 3:30.
I learned something new today: Ford appears to only scuff the edges and relies on adhesion promoter for the remainder of the surface. But for most situations, this prep method appears to be adequate and preserves the factory finish. I suppose this could be favorable from a corrosion standpoint.
I am curious why Line-X/Bulletliner have not adopted this method. If the OEM's are doing it with success, why not?