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I treated the spoiler install like I was prepping for ceramic coating. Removed all the leftover adhesive from the factory spoilers, clayed, polished, removed any leftover waxes or films with carpro eraser, used 3M adhesive promoter, and my edges still lifted even after taping them down for a couple of days after install. It's not terrible but I notice. I wouldn't be surprised if BMW went back to Betalink due to getting tired of customers bringing their cars back in to get the spoilers refitted due to the edges lifting.
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