Just like with most natural products, glues have an expiration date.  You'll notice, especially with your natural glues (protein/gelatin based) and liquid water-based glues, that after they have hit their expiration date they may become moldy and unusable.

What do you do if your glue is expired?

What holds the world together? Glue.

Industrial adhesives are the sticky backbone of thousands of companies across a variety of industries, including woodworking, packaging, graphics arts, manufacturing, and more. Depending on what you’re trying to stick together, your choice of glue matters!

It may not have crossed your mind, but weather has a pretty major impact on your glue. How? Well, liquid water-based glues specifically require special attention when it comes to storing them in the cold winter months. 

Considering making the switch to liquid glue for your packaging? This list of pros and cons will help you determine if it is the right glue for you.