Crystal Clear Crackle by ArtsSyVille Embellishments dries to a hard, clear, glossy nonabsorbent surface creating a "cracked porcelain" pattern which an overglaze will enhance. Crystal Clear Crackle is a process that does require sizing or can be further enhanced with Cracking Size. Apply one layer of Cracking Size and allow to dry, then apply the Crystal Clear Crackle for a beautiful clear porcelain style crackle.