Definition
An adhesive supplied as two separate components — typically a resin and a hardener (catalyst) — that must be mixed together in the correct proportions immediately before use. The chemical reaction between the two parts causes the adhesive to cure and harden into its final bonded state.
Plain English
A glue that comes in two containers. You mix them together right before you use it, and the mixing is what makes it set hard. Once mixed, you have a limited time to apply it before it stiffens up.
Context Anchor
Seen in aircraft maintenance and repair work, especially when bonding, sealing, or repairing parts according to the maintenance instructions.
Derivation
Adhesive comes from the Latin idea of “sticking to” something. That helps here because the purpose of the material is to make two surfaces stick together strongly after the two parts are mixed.
Why Pilots Care
Creates strong, airworthy bonds required for safe structural repairs on aircraft components.
Analogy
It is like a two-part household epoxy: each part by itself does not do the full job, but once the two are mixed, the mixture begins to harden and bond.
Intuition Check
Do not think of a two-part adhesive as ordinary glue that is ready to use from the container. Its strength depends on mixing the two parts correctly before applying it.
Example Sentence 1
The mechanic carefully measured equal amounts of resin and hardener before applying the two-part adhesive to the composite repair.
Example Sentence 2
Follow the product instructions carefully when using two-part adhesive on any primary structure.