For protecting areas of a print from toning or dying. Being bright red it is easy to see where it is being applied. The red pigment will not stain or discolour photographic emulsion. By brush, using bold strokes flowing it towards the required outline. Fotomask has good surface tension and resistance properties, therefore only the thinnest coat is needed. Avoid over brushing, which due to the rapid drying characteristics will cause lifting and sticking. If this should occur or the brush becomes sticky, simply dip the brush in Fotomask Brush Cleaner, Item 307410, until pliable and continue. To remove Fotomask simply attach a piece of adhesive tape or similar to the edge of the Fotomask and peel off in one sheet. If you have toned the print always ensure that you re-soak the area under the mask before drying the print to avoid cockling. Fotomask has been found useful to cocoon printed blocks, also to protect precision metal surfaces from the effects of pollution and oxidisation. It is also used to protect optical surfaces and as a printed circuit etch resist. Its instant removal without solvents is a great advantage over traditional greases and waxes. Fotomask must not be used in an airbrush. Do not use the Brush Cleaner to dilute Fotomask as this will prevent it stripping. CAUTION - Fotomask will bond permanently to some plastics.