Using Mont Marte Crackle Paste, you can add crackle and texture to your artwork. This opaque medium works well for creating surfaces on canvas, wood, and polymer clay, among other materials. Mont Marte Crackle Paste can be used to create intriguing textures and effects. Features: Adaptable to a variety of surfaces, such as wood, canvas, and clays like polymer. Sandpaper drying time: two to three hours. opaque coat.