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Agree on the "not prepped properly" stuff. Doesn't just mean wiping down both sides. It means going through the whole process from cleaning thoroughly with alcohol to keeping a good amount of pressure on it over night. Sounds like a pain in the ass, but it's worth not having $300 fly off your car on the highway. FT86SF has a great video on it:
[ame]https://www.youtube.com/watch?v=z87aSmGkyrw&t=21s[/ame]
If you did all that and it still doesn't stick, then the spoiler probably doesn't line up enough on the trunk for the 3M to stick which just comes down to poor quality. Certainly wouldn't use glue to apply any kind of aero on a car for obvious reasons. Good luck
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