I have an 02 SVTF with a wing issue...3 years ago some dumb#$@ ran accross the top of my car

. In the process broke my factory rear spoiler off. I have tried double sided tape multiple times and the heat just melts it off again. Factory says that it is taped when it comes from factory, however i tried the tape he recommends and its worthless. im very close to using jb weld but i want to replace it eventually with an aftermarket wing at some point.
Does any one know how it comes stock from Ford, and how do you recommend fixing it?