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The key besides 3m tape ie the red stuff is prep. You gotta clean the sh*t out of the hood. Wash and wipe down with alcohol. Then wipe it again and again. Then try to center it. Lol. The hardest part. Mines be on about a year and with 70 or so runs down the quarter mile and its holding tight.
I put a Roush scoop on my F150 with 3M. It's held well since 2007. Aside from the good cleaning I also used adhesion promoter. The scoop holds up well to long highway trips.