Cardboard box prevents overspray Prevent paint “overspray”with this clever spray booth made from a cardboard box. Cut a hole in the top of the box. Cover the opening with plastic wrap and position a shop light above to illuminate your project. You can use coat hangers, poked through the cardboard, to hold and rotate the objects as you’re painting them. Not only will your shop be neater, but your paint projects will now be thumbprint free.