This is sooooo much fun! We used this site to learn how to do it. Now we make ALL of our backdrops this way. I use glue and styrofoam and then use spray styrofoam as well to go around the edges as well as make small ledges. Then we cover it all in concrete. Also we attach it by using a high end industrial velcro. Here is the site. Have fun!!! Its a blas!t!
http://www.lizard-landscapes.com/index.html
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