Gluing art to the back support area. You will glue down the stone background first. You will notice that there are two whitish spots on the left. That was an accident dropping my brush which stuck fast to the glue and pulled up the surface when I picked it up. To fix it, see next step. Mark where the hinges end, so that you can cut out a 1/8th slot to fit the paper around the hinges. You can glue down the mask and the carved frieze as soon as you have checked the masonry layer for bubbles. Tilt the surface against the light to look for the bubbles--it is so much easier to fix them when everything is still wet.