The vinyl sheets that came with your kit are reusable. The design you create with the paint will peel off the vinyl (acetate) sheet once it is dry. We suggest at least 12 hours drying time. After peeling your design off the vinyl sheet, the artwork should cling on glass windows or mirrors. We do not sell the plastic sheets separately. We have found that the paint works well on almost all forms of plastic, such as plastic wrap, acetate/transparency sheets, sandwich bags and freezer bags. Some of the plastic surfaces allow faster and better drying time than others. You may also wish to consider the weather conditions in your area, such as high humidity.