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I used Optimum Opti Coat 2.0 on our Midnight Blue X1. It's semi-permanent, and is holding up really well. It's not really the ideal thing to start with though if you're not fairly familiar with different synthetic sealants, so follow the above advice and try something like Wolfgang, Zaino or just read up a little at a detailing site like Autopia.
I would strongly suggest a clay bar and something to deal with light swirls, as I have yet to see a BMW delivered without visible contamination and swirling.
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