This is an acid-free PVA* glue for use on side seams of envelopes, collage, book binding, framing & box making. The highest quality permanent glue for all paper gluing. Dries clear and doesn't cause paper to shrink or buckle as much as regular "white" glues. It's fast setting, remains flexible with age, remoistenable with water. Can be fully reversible. It can also be added to paper pulp to attach it to pressed pulp, or to add additional pulp to a dry piece. Subject to damage at freezing temperatures. (* PVA= poly-vinyl-acetate)