The Problem with Wood Glue

Wood glue is an adhesive that originally was made from animal proteins, today it is more commonly made from polyvinyl and epoxy resins. It is an essential part of woodworking. However, it can go bad over time if not stored properly. Some types of wood glue can last for decades beyond their official shelf life while others may be good for just one or two years. The best way to know how much life your brand has left is by reading its expiration date on the label. If there’s none, then you’re probably safe using it until it goes bad. But even when the label says, “use within 12 months,” don’t assume that means it won’t dry out over time. In fact, some manufacturers recommend storing their product in a cool place away from sunlight, so it doesn’t get too warm and starts drying prematurely. A well-kept glue in optimum conditions is long-lasting glue!

Wood glue can’t be stained. Wood stain works by soaking into wood pores deep underneath the surface. However, Wood Glue does the same thing. When applied to bare wood, wood glue seeps into wood pores allowing for a tight bond between two pieces of wood. If you apply wood stain over wood glue, wood stain won’t be able to get into the wood pores underneath the glue. All of which means that your stained plank of wood will end up with an unstainable section right where that glue was applied. To prevent this from happening, it is always best to wipe off any extra glue that may be dripping from the areas where you applied the glue, then when the glue is dried, sand off any extra that may be on the topcoat of the wood to ensure the stain will be absorbed.

Wood glue is often misconceived as the only method of joining boards together. And don’t get me wrong, it does work great when you clamp and let it dry completely. But for the best and longest lasting bond, you are going to want to secure your bond with a nail or screw as well.