Incredible Growing Paint! Use this non-toxic, waterbased paint to create 3-dimensional artwork on a variety of surfaces including paper, cardboard, wood, stone and fabrics. Allow paint to dry from 3 to 12 hours depending on amount used. When completely dry, heat with a hair dryer or heat gun. As it's heated, the paint puffs and swells for a fun effect kids are sure to love. Classroom pack includes 4 bottles of 6 colors: red, yellow, blue, green, purple, and brown for a total of 24 - 0.74 oz. bottles. AP Certified Non-toxic. Please note: Heat device requires adult assistance.