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Undercoat is waste of money. It gets everywhere, and the techs will absolutely love you when it comes time to work on your car. My old WRX, 5 + years, rallies, daily driven, and no rust.
Modern day cars are a lot better then the cars of yesterday, not to mention, the car has a warranty on rust anyways, so if it starts rusting within a few years, I'd be worried as to why.
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