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I'm new to it having done the Macan about a month before the X3 now. So I can't speak to longevity yet and will let others chime in (you might also search youtube for 6 month, 1 year etc reviews).
I can tell you (in light of your other question in the other thread) that I only used 1 bottle. Dunno what they are thinking with the 3 bottles thing. For the most part I ended up with extra from 1 bottle on the Macan, so I went even heavier on the application on the X3 and still managed to have leftovers from a single bottle (one bottle per car). It spreads really well, I don't see needing more than a single bottle to apply it. Granted I only did a single coat on most of the car (2 coats in the hood and roof where it's most noticeable). I did not coat my glass or wheels. Yet. I'll likely do the wheels. Not sure I see the value in the glass beyond rain-x style effects.
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