A.Polyurethane glues are the best exterior wood glues to use in colder temperatures. Most water-based products like cross-linking PVAs have a minimum-use temperature (some as high as 60°F). Because reactive polyurethanes are 100% solids, there is no concern with minimum-use temperatures. In fact, tests have shown that the bond strength with some polyurethane adhesives actually increases as the temperature drops. Although most polyurethane glue manufacturers recommend that their glues be applied above a minimum temperature (usually 32°F or 40°F), they can probably be used at lower temperatures.
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