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I'd research the efficacy of any kind of interior/exterior surface treatment option that is sold to the consumer by the dealer. My understanding is that a good deal of them are scams dealers make money on and do not add anything to the longevity of the factory paintwork, which already has clear coat layer(s) on it. If they did, why wouldn't BMW incorporate them into its own surface finish processes? Anyway, I'm not saying they must all be scams, but I'd be skeptical.
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