Lineco acid-free adhesive has excellent lay-flat properties and dries clear. Easy to use polyvinyl acetate (PVA) formula is water soluble when wet so it can be thinned with water to extend drying time if desired. This adhesive was formulated specifically for preservation materials and will not become brittle with age. Adheres to most porous surfaces. Take advantage of the lower cost on gallon containers of adhesives. Now you can use the rugged, reusable plastic pump to dispense small quantities of glue from gallon containers.