I do professional mobile detailing here in Northern VA. Average price from a reputable installer for a 3-5 year coating should not run you anymore than $1,000 - $1,200
Me personally, I charge in the $750 ballpark. Anything above $1,000 in my opinion it should be a warrantied coating / work. Personally though I'd never pay over $1,000 for a coating as a consumer - Especially not a on literal brand new G20. Car is not going to need a ridiculous amount of prep.
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