Psh, you fellers don't know nothin'. Quik-crete holds better than any glue! Apply a thin film to your tailgate with your favorite trowel and press on your trim and she's there for eternity!

All kidding aside, I have used quik-crete before and it's pretty good stuff. Used it setting 4x4 posts too, and it works great! Pressure treated and concreted in she won't go nowhere.

 

Have something like 15 bags of it sitting in my driveway waiting for cooler weather next week.

 

Well I guess I could have squirt-filled my tailgate shell with Quik-crete through the existing holes, and then staked my reflective strip on with pressure treated wood posts, driven through the tailgate with a sledge hammer. It might have held, but the aesthetics of it all would be quite horrid .