FolkArt-4 ounces of crackle medium. For acrylic paint. Waterbase. Basecoat surface let dry apply medium let dry. Apply contrasting topcoat color. Topcoat must be applied for cracking to occur. Cracking shows when paint dries. Do not use in humid conditions. Cleans up while wet with soap and cool water. Non-toxic. Conforms to ASTM D 4236.