I Craft Crackling Gel 50 ml Works on many surfaces such as wood, terracotta, metal, ceramic, paper, canvas, glass, fabric,Card stock, Chipboard. Apply A Medium To Thick Coat of Cracking Ost And Allow To Dry Once Crakes. Appear You May Speed Up Drying With i iCraft Hot Air Craft Tool. For Porous Surfaces Like Canvas Or Wood Base Coat With Paint Let Dry.