Liquid Mask is used to reserve areas which are to remain unpainted; especially in airbrush techniques. The product forms a protective film on the area which the artists does not want to paint. Once the work is dry; liquid mask is rubbed off revealing the unpainted area. Use with brush. Shake lightly and test on surface before use. Do not leave applied for a long time. To remove; peel or rub carefully once dry. Keep from freezing.