I just opticoated my Golf 7 today and its flat white. The reason for sealing car paint is multi fold. For me the biggest reason is for the extra layer of chemical and scuff resistant protection. It's great piece of mind to know when you spot some fresh bird dropping that there's something there to delay the acid from eating your clear coat.
Hydrophobic qualities is also handy as it helps with washing your car and manages to keep the car cleaner for longer.
Oh and plus it's shiny and easier to maintain then using wax alone.
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