Spray-on paint protection.

Opti Coat is far from cheap (figure well over $1,000 if paint correction is required too), but it's widely regarded as the strongest paint protection out there today.

Check out this BMW i3 getting the full treatment (paint correction, full detail and Opti Coat) in this expertly produced video from Definitive Car Detailing.

Some results of note shown at the 4-minute mark.

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