Titebond polyurethane glue titebond 2303 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 stone and other porous or non porous materials titebond polyurethane glue is ready to use offers excellent sandability and is unaffected by paint varnishes and other finishes it is twice as thick as traditional polyuretha