So, I got a lip spoiler from spoiler depot and put that on. Compounded and alcohol preped the surface. After about 2 or 3 trip on the highway at 110 to 115 mph the side started to lift a tiny bit. So....I used a couple of m-fiber cloths and sponges to protect it and then used a clamp to try to get the side to hold nice and flat. Didn't work but now I have a nice little circle mark that scuffed up the clear coat on the spoiler! I didn't even crank it down hard. Just enough to hold it. It does not want to compound out either! I smart like truck! No one else but me and some people on the forum would notice but it pisses me off!

Same exact thing happened with my lip spoiler. No one can tell but me and it drives me crazy. I haven't called yet but someone suggested a bimmer stealership for their tape they use for BMW spoilers. It's supposed to be pretty strong. I didn't use the clamp though...

Mine really doesn't bother me anymore though.

little things on my car bother me that other people dont even notice, i know how you feel haha, and yea it might be a good idea to try bimmer stealership