Dcopatch Gesso can be used on all materialsglass, metal, wood, plastic, polystyrene, ceramic, terracotta, cardboard, papier-mch, and moreas well as on any surface, whether flat or irregular.The varnish enhances the protection of Dcopatch glue, with which it is fully compatible.Gesso provides a smooth, white base that makes Dcopatch paper designs (not included) stand out beautifully.You can also apply a layer of gesso over a previously decorated object to give it a fresh, renewed look.