I spoke to the guy at the bodyshop about tigerseal and he said the tape is fine as it's the stuff BMW use to secure their spoiler lips to the boot. The Vertex spoiler is plenty secure. Maybe it's because I use rain-x on the windows so it's not bonded to the glass properly.. it didn't fall off, I noticed it was sticking up at one side from about halfway so I pulled it off to save it coming off when driving. It's a gash fit as it doesn't have the correct curvature for the window, it's too flat on the underside so sticks up a bit at the sides and needs bending down, but it really isn't very flexible. Would have expected better from a company like origin.