Blair Spray-Fix Matte Workable Fixative is clear, permanent, waterproof protection for pencil, charcoal, pastel, chalk, tempera, etc. Dries in seconds to a matte finish which may be reworked or worked over with any art medium. Formulated to minimize change in color values or curling and buckling when used on thin art papers. Safe for blueprints and Ozalid reproduction.