Wrapping black cars with clear gloss PPF is always tricky as any dust or fibers under the film really stand out. One great way to keep the surface pristine right before the install is to go over it with an Ion blow dryer. This significantly reduces any charge on the surface which helps ensure a perfect install. It only takes a few seconds to do and is worth building into your protocol. It's especially good to do in the winter months when the air is dry and the static charge on vehicles can be quite high.