- A versatile surface specially formulated for most water coloring and mixed media techniques. Stamp, ink, or color with water-based mediums. Choose your favorite side to create on. The smooth finish for detailed work or textured for creating layers of color. Watercolor Cardstock is a heavyweight 118lb surface that resists buckling and dries quickly. Available in 4.25″X5.5″ and 8.5″X11″; prices vary.