Window Visor not sticking thoroughly

[Smellycat]

I got some ikon mugenv2 visors, and on 2 of them, i just can't get the corners to stick, and i'd really hate for one to potentially fly off, despite the strength of 3m and it strengthening over time.. just want it all stuck nicely.

what kind of adhesive would I be using? ;o the same one for emblems? or?

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