Titebond Polyurethane Glue is a professional strength waterproof glue specially formulated for multi-purpose applications. In addition to its superior wood-to-wood performance, it is equally effective for metal, ceramic, plastic, Corian(r) stone and other porous/non-porous materials. Titebond Polyurethane is ready to use, offers excellent sandability and is unaffected by finishes. Twice as thick as traditional polyurethanes it provides a non-running, non-drip glue line for more precise applications. Titebond Polyurethane will not become brittle with age and will not expand or contract in the glue joint. Polyurethane glues cure by moisture and an effervescence is a by-product of this, there is no strength in this and it is easily sanded off when dry. In very dry timber it may be necessary to moisten one surface to encourage curing to take place.