Our literature states the shelf life of all of our glues as one year. Titebond Liquid Hide Glue includes an expiration date on the bottle, because it can progressively lose its ability to dry hard, and this change is not visually obvious. Titebond Polyurethane Glue has a one year shelf life in an unopened container, but is useable as long as the glue remains fluid. Polyurethanes, however, are designed to react when exposed to moisture and can sometimes begin to cure after the bottle has been opened, and solidify. Most of our yellow and white glues, including Titebond Original and Titebond II, remain usable beyond two years. Should Titebond Original become thick and stringy, or Titebond II turns into an orange colored gel, these changes signify that the glue is no longer usable. The minimum shelf life of Titebond III is stated as one year, when stored appropriately at room temperature. Titebond III is expected to last beyond its stated shelf life. If thickened, shake vigorously by firml
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