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I put opti coat on my 2012 aw 135i when we first got it, jun 2011. For me it seems to work, it kept the paint nice and shiny, made the finish seem "harder". We've put about 17000 miles on the car since then, just had a major detail done and the detailer said that I had very little swirling. He used a different sealer when he did the detail so I will see how that holds up over the winter. I think it took me about 45min to put on the opti coat but that's including windows too. Good luck
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