Polyurethane glue is truly multipurpose
Polyurethane glues like Gorilla Glue and PL Turbo outperform PVA glues in several applications, such as bonding foam, stone, concrete, and ceramics.
One benefit of polyurethane glues is that because they are not water-based, they are not drawn into wood pores as drastically as PVA glue. For this reason, wood joints glued up with polyurethane accept stains and clear finishes better than with other types of glue. Polyurethane glues also enable you to glue up pieces even after a finish has been applied.
Because polyurethane glues cure by a chemical reaction triggered by moisture, they work well on wood with high moisture content or on oily woods, where PVAs have a hard time bonding. Polyurethane glues generally take six to eight hours to reach full strength and require the workpiece to be clamped for a proper bond. The clamps usually can be removed after about four hours.
The cured strength of polyurethane glue is slightly less than that of PVA—generally around 3000 psi—but still plenty strong for most any home-building application.
Prior to drying, polyurethane glue can be removed using solvents such as mineral spirits or acetone. Once the glue has cured, you can scrape or sand away squeeze-out.Best uses:
Oily woods, finished components, nonwood materialsCost:
$12 to $16, depending on bottle size