I'd say just do proper maintenance of the paint eith regular washes and like once every quarter do detailing.

IMHO coating is a bunch of BS. PPF may offer some protection from stone chips but can it really withstand sharp stones at highway speeds, I am honestly skeptical, plus the color will be slightly different after covered by ppf. If your eyes not so OCD then maybe ok but for me I don't like that. I'd just live with whatever stone chips, take it as battle scars! If don't want any single damage on paint then just don't use the car! Lol