Pebeo liquid frisket for watercolor and airbrush is applied to a surface to mask areas where color is not desired. The low odor formula contains synthetic latex and is AP non-toxic certified, while the original formulation contains natural latex and a CL irritant warning. Either one may be applied with a brush or applicator bottle. Apply to all shades of paper, allowing 10-15 minutes drying, before color is applied. To remove the drawing gum, gently rub it with a finger or eraser. Gray tint allows for exact detail work in application, as well as easy identification for removal. Use with ink, watercolor and gouache. Water soluble when wet, but dries waterproof.