I installed my performance spoiler with 3m tape too. I noticed that the middle of my spoiler has what appears to be a crease or line in the middle of it. Its hard to see, but at the right angle, I can see it. Take a look. At some angles it looks MINT. But as you can see, at a certain angle, I can see a crease down the middle of it. Should I go exchange it?
normal looking at this angle.
http://imageshack.us/photo/my-images/193/spoiler2v.jpg/
http://imageshack.us/photo/my-images/683/spoilerdf.jpg/
crease at this angle
http://imageshack.us/photo/my-images/710/crease.jpg/