Well,
I attempted to install and can verify at least for mine, the tape that came with it sucks - didn't hold. I'm going to purchase some VHB tape but upon researching, I discovered there's a bunch of different types of 3M tape options, which one would be best? Also, some are pricey, kind takes some of the value of the spoiler away, oh I did use the adhesion promoter maybe I had a bad batch of tape
https://www.amazon.com/dp/B002JOVUO0..._t1_B00JR4D7AA
https://www.amazon.com/3M-VHB-5952-A...BD40HC8TRRBK2K
https://www.amazon.com/3M-38583-Exte...t_sims?ie=UTF8