Southcrete™ 580 Multi-Purpose Tile Mastic is a white acrylic latex based adhesive which will bond ceramic tiles to structurally sound, firm, dry surfaces such as Gypsum wall panels, exterior grade plywood (interior), plaster and cementitious backer units. This material is non-flammable and emits no toxic fumes. It spreads easily, is water resistant when dry and is freeze and thaw stable for storage.