This non-removable, water repellant liquid wax is designed for masking specific areas of paper, making them permanently resistant to water. When dry, the medium will repel superimposed washes for interesting textures and effects. You can also mix the masking fluid directly with color to make specific strokes permanent. Once dry, you can apply additional layers of watercolor that will adhere to the masking fluid. Excellent for details. Allow to dry completely before overpainting. When dried, texture is much smoother than removable masking fluid.