I used Betalink on mine. It's solid as a rock. I have no fears at all about it coming off, and even use it to close the trunk sometimes.
The stuff is a complete mess though. The applicator tube they send sucks like a cheap whore, and the shit gets EVERYWHERE!
On top of that, it's hard to clean up the excess after you've installed the spoiler.
I'd probably try the tape if I had it to do over, but I can't say for sure that it will hold as well as the Betalink.
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