Deco Art-Media Crackle Glaze: Clear. A water-based, fast-drying topcoat that creates eggshell cracking pattern as it air-dries. Once the glaze is dry, cracks can be enhanced by using media antiquing cream (sold separately). This package contains one 4oz jar of media crackle glaze. Conforms to ASTM D 4236. Acid free. Made in USA.