Crackle Crust is a two-part, water-based system; the Crackle Crust Size and Crackle Crust Colors are used in conjunction with one another. The Crackle Crust Size is the foundation upon which to layer the Crackle Crust Colors if crusting is desired. Crackle Crust creates beautiful and unique old-world crusting effects on walls, furniture, or any surface.