Campus masking liquid 55 ml allows you to fix parts of the canvas using watercolor paints, gouache and inks. The liquid is faintly colored to distinguish it from the white surface of the canvas. The paint can be applied after the canvas has dried. Before applying the masking fluid, always perform a suitability test on the selected surface. Perfect for brushes or pens. Wash your painting tools immediately after use in warm soapy water.