What did you use to stick the spoiler down???
Did you correctly prepare the surface? (i.e clay to remove all contaminants and rub down with IPA/surgical spirit)
I used no more nails double sided tape (red) and haven't had an issue with the front aero or m3 boot lid spoilers.
E92 335i | 6 Speed manual | BMS 4xLED Halo Bulbs | JB4 (waiting to be installed) | BMW Performance Gloss Black Grills | BMW Performance Exhaust | Smoked side Repeaters
Aero Front Lip | M3 Lip Spoiler |19" Cades Tyrus 'Gunmetal' with polished lips | Falken FK452 Rubber
........... More to come