Definition
An adhesive that forms its bond by losing its solvent or carrier (usually water or another evaporating liquid) into the surrounding air, leaving the solid adhesive components behind to hold the joint together. Common examples in aircraft work include casein glues and certain animal-based glues, where evaporation, not a chemical reaction, is what hardens the bond.
Plain English
A glue that hardens because the wet part dries out into the air, leaving the sticky solids behind to hold the parts together.
Context Anchor
Seen in aircraft maintenance, wood aircraft repair, and homebuilt aircraft construction when parts are joined with glue.
Derivation
From the everyday sense of 'dry' meaning to lose moisture. The term simply describes how the glue cures: by drying, not by chemical reaction.
Why Pilots Care
Premature loading of a joint before the glue dries can cause structural weakness that may lead to in-flight failure.
Grounding Statement
A glued joint may look ready before it has actually become strong enough to use.
Intuition Check
Do not assume “glue dries” only means “the surface no longer feels wet.” In aircraft work, the important point is whether the glue has hardened enough to safely hold the parts together.
Example Sentence 1
Casein adhesive is a glue that dries, so the joint must be clamped and left in open air long enough for the moisture to evaporate.
Example Sentence 2
The inspection checklist requires confirming the glue dries completely before covering the wing with fabric.