I attend the Greater Hartford Academy of the Arts in Hartford CT as a Theater Design and Production major. We are putting on a show right now that we need a small pane of fake glass in a full window to be broken every night. We used a product called "smash plastic" it?s a two part plastic (1:1 parts) that you mix together. When it hardens it is technically plastic but breaks like (but easier than) glass. It is very easy to clean up and you don?t have to deal with the gross sugar on the deck every night. The way we made our panes of "glass" was to take a pane of plexi glass cut out of the opening the smash plastic was to go into and formed an aluminum foil frame around it. We then removed the plexi and poured the smash plastic mix into our new flexible mold. You just need to make sure that the corners are not tightly folded together so they do not pull up and cause the plastic to be thicker in some parts and thinner in others. It is also very important that while the plastic is setting up that it is level for the same reason. I am not entirely sure where we bought this from but it is a great product. the only thing is that air bubbles get trapped very easily inside the plastic and there is almost no way to get them out. We hear that the only good way to get them out is to put the unset mold into a vacuum chamber as it sets and it will suck out all the bubbles. Also the tin foil makes lines in the rear sides of the pane but they are barely noticeable during the run of the show. I hope this is helpful.