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Generally, if done well, the PPF (paint protection film) is invisible to the human eye when new. Though eventually it will yellow and discolor and become visible. (Think older clear bra)
3M is a good brand for the quality of their film, so I'd be mostly worried about the installers and not the product they're installing. For example, check out some of the top PPF installers online / YouTube and you'll see how they do it. (Darien Detailing does good stuff, Topaz in London, NVN London and NVN Dubai etc.)
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