This drawing gum (also known as a masking fluid pen) is used to preserve white areas on canvas or paper when painting with watercolours and inks. It is applied with a brush, left to dry, and can then be painted over. Once finished, it is simply rubbed off the material. Drawing gum can also be used to cover already-drawn motifs so that you can colour the surrounding area without damaging the original design. Wash the brush with water immediately after use! Drawing gum contains a weak ammonia solution, which may cause a slight ammonia smell. This is not a product defect and the smell fades quickly. Wash the brush with water immediately after use! Store closed and out of reach of children!