I am currently designing scenery and lighting for a production of The Wizard of Oz. One question I'm facing now when its coming down to building materials is how and which various surfaces can be painted in the multitude of ways that the show is calling for. My question involves the current layout of The Emerald City: One of the show decks will be a dark green checkerboard which will be visible for the entire second act of the production. Embedded in it are a few lines of small chaser lights. So, my primary question is how to make it as glossy and shiny as seen in the image below. I was thinking polyurethane because it can be cheap and fairly easily applied over the checkerboard pattern. The only concern I had was time of drying and ventilation in the process. On a similar note, the facing of the palace wall/bridge is a corrugated material (plastic preferably for weight). I also want this to have a shine to it; however, not as strong as the floor. My concern was of course painting and applying something to plastic...I'm kind of at a loss for ideas here. Perhaps I'm just overlooking something simple. Below is a rough rendering with most of the major scenic pieces. Hopefully you can get an idea of what I'm looking for. Thanks for help in advance!