Hm..that's funny (j/k) Uhm..I bought my ACS aero through CEC and the technician told me regardless of the glue that comes with it, use 3M double sided tapes nevertheless. That's all I use on my 4 door and it's fine (been through storm..etc) I didn't use the glue because I thought the rear window may look ugly if I take it off. The instruction also says that you have to paint it or something. I'm glad I have a good tint in the back. Just my 0.02