** Tclederman, **I highly suspect the failure with your sealed/painted cardboard panels was water/moisture intrusion over time. ** The abs I used is nearly bullet proof and will not absorb moisture. The adhesive I used was * 3M Hi-Strength 90 * in a spray can and water proof, a little pricey but really good. You can't go wrong with this method just follow the directions on the can in detail.
