I have had problems with delamination of the water resistant board during assembly and every day handling. I have tried the Dollar Tree board and had the same problem. The Borden board does not have this problem, but weighs a ton. I have tried several things to solve this problem. Coating the exposed edges with hot difficult and was a an ugly mess. Next I tried super glue and ended up with my fingers stuck to every thing. What I believe solved the problem was to paint all exposed edges with carpenters glue with 25% water. Don't paint surfaces that will be hot glued. The solution soaks into the foam and hardens it. There is no delamination during assembly and usual handling. It is easy to wipe off runs, and dries clear. Since the foam absorbs the glue, it is far more ridged and adds strength and almost no weight. Try this out and let me know what you think.