Coatings aren't exactly a protective barrier from damage. You can PPF your whole car, but you need bread for that

For either I hope the installation includes paint prep. Paint should be polished first, as whatever swirls and scratches are in the paint now will still be there once the coating or film go on, and fixing them won't be possible without buffing through the coating and reapplying and blending it in.

<-- Dave Thomas knows what's up...
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Jay: Look here homie, any nigga can get a hit record. This here is about respect.
Game: Like Gladys Knight.
Jay: Aretha Franklin.
Game: Word, I like her too.
Jay: Nigga...