Yeah, the customer doesn't always get that they are just trim either. They think it's a stinkin' frame and they can haul around a 4x8 sign just holding onto the trim.
What about gorilla glue... I know it's not clear but if you don't goop it on?
I use Gorilla Glue. Just a bit every 6 inches or so on the Alumalite, not the edging. Haven t had a failure yet. I always run a diagonal of blue tape across each corner so there's no question the this is edging and not part of the board. I hope the clients remember to remove it before they put up the sign.