Karnak #920 Fibered Emulsion Mastic will not burn or support combustion in a liquid state. It has no odor or fumes, and resists the absorption of exterior moisture. Karnak #920 Fibered Emulsion Mastic is a general purpose coating, manufactured with refined asphalt, clay emulsifiers, and selected non- fibers. The dried film cures to a tough, flexible, durable finish and will resist variations in temperature and weather. Karnak #920 Fibered Emulsion Mastic may be applied to slightly damp surfaces.