Introduction to Polyurethane Adhesives

Polyurethane adhesives are generally user friendly, but there are important details to be aware of for storing your glue to maximize its shelf life, determining if it is usable, and working with and disposing of it safely.

What’s the best way to store polyurethane glues?

To prevent ambient moisture from curing glue in the bottle, squeeze excess air out or store in a sealed plastic bag after use, tightly secure the cap, and store in a cool place, away from direct sunlight.

What’s their shelf life?

Gorilla Glue has a shelf life of about a year, Akfix PA 370 around 9 months. In our experience, these are somewhat conservative; shelf life is maximized under proper conditions.

How do I know if my glue has gone bad?

Its consistency will change significantly; it will partially or fully cure.

Are PU adhesives freeze/ thaw stable?

Yes, but temperatures lower than 14°F (-10°C) may shorten the shelf life.

How do I dispose of glue that’s no longer usable?

If the glue has fully cured in the bottle, it is an inert solid and can be disposed of safely. If only partially cured but not too thick to pour from the bottle, spread the glue out on a surface or bed of wood shavings to cure completely.

Are there any safety precautions I should take when working with polyurethane adhesives?

PU glues are harmful if swallowed or the vapors inhaled. Use in a well-ventilated space. They may be irritating to eyes and skin, so avoid contact by wearing safety glasses and nitrile, natural rubber or polyvinyl alcohol (PVA) chemical-resistant gloves.