Whenever we print on foamcore board that people plan to take from place to place, I worry. It is so easy to smack the edges into a doorway or trunk lid!
There is a solution, though. We carry Edge Trim, a thin plastic U- Channel that fits on the edges of 3/16 foamcore, gatorboard, and Ultraboard. It not only protects the edges, but gives the look of a thin frame.
We stock it in black, white, silver and clear. We sell mostly black, though.
Below is a picture of the edge trim.