"Glued faux ceiling tiles to existing acoustic ceiling tiles and glued up styrofoam crown moulding. This saved a lot of work by not having to remove existing ceiling tiles."
Tips: Work from center of room out to walls. This will ensure end cuts at opposite walls are the same. Let glue get tacky before putting up panel. I used a flat floor mop (the kind used with laminate floor cleaner) to press panel against ceiling.
-Richard Burns