Our office purchased one DEF8x4 (as a test) for our conference rooms, which were painted two months ago with eggshell latex water-based, white paint (BEHR).  We applied the dry erase surface as per the installation video.  Initially there were no bubbles and the surface stuck very well to the wall for the first 4 days.  On day 5, the surface was crumpled on the floor.  We are contemplating trying again but using a 4x8 plywood surface (G1S) and then drilling that into the wall instead of relying on the adhesive to stick to eggshell paint.