Rear spoiler

I noticed a few weeks back my rear spoiler was coming unstuck from the top, and when on the motorways if its very windy the rear window will vibrate like crazy. It seems like air is getting trapped under it and trying to lift it up.

Whats the best way to stick it back down?
 
Personally I'd try Sikaflex or something similar. I never got round to changing the spoiler on my almera before I sold it, so I've no idea if it's screwed in or not, but if it's anythink like the gti splitters/skirts it's probably just glued on.
 
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