Adhesive science has come a long way in the last number of years. Most new cars use panel adhesives now. If you bond 2 pieces of 20ga metal together, you will tear the steel before the bond releases.
When the flare is mounted with the adhesive, I'll use nuts and bolts to fasten until the bond sets. The flare lip with be trimmed and sanded before installation. When the excess bond gets squeezed out from the lip, I'll simply run my finger over the lip, just as you do with caulking to remove the excess and give it a clean smooth finish. I don't plan on doing any sanding around the lip after it sets. Then I'll remove the nuts and bolts and fill the holes.
Will
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