Duct tape just wasn't cutting it for mounting poster board. Over time, my poster board would just fall off the wall. And since it was mounting my daughter's finished puzzle, I really didn't want to get it damaged :)

This poster board wall mount hooks in to the back of the poster board with 4 teeth as shown in the first picture. I used a piece of duct tape to hold the mount to the poster board. All of the hanging load is held by the teeth and not by the duct tape, so it won't fall off and your hard work can be proudly, and safely, displayed.