When glue dries, it undergoes a process called curing, during which it transitions from a liquid state to a solid state. The volume of glue typically decreases as it dries due to the evaporation of solvents or water present in the adhesive formulation. However, the extent of volume loss can vary depending on the specific type of glue and its composition.
Different glues have different formulations, and their drying characteristics can vary significantly. Some glues, such as water-based glues or white glues, contain a high percentage of water as a solvent. As the water evaporates during drying, the glue can shrink in volume.
When a bottle of glue is left open, the exposed glue can gradually dry out. Over time, the liquid portion of the glue will evaporate, leaving behind a more solid and concentrated residue. If the glue is not used for an extended period, it may become very thick or form a skin on the surface.
If the bottle of glue is partially open or not sealed properly, it is possible for the remaining liquid glue to lose volume and become thicker due to the continued evaporation of solvents. The glue may also stick to the sides of the bottle or container as it dries, especially if it is not agitated or stirred regularly.
It's worth noting that different glues have different characteristics, so the specific volume loss and behavior during drying can vary. Always refer to the instructions provided by the glue manufacturer for proper usage, storage, and handling guidelines to ensure optimal performance and longevity of the adhesive.