Definition
The adhesion of paint to a prepared surface, achieved through proper surface cleaning, treatment, and primer application so that the topcoat forms a durable, lasting bond with the underlying material.
Plain English
How well paint sticks to the surface it is applied to. Good paint bonding means the paint holds on tightly and does not peel, flake, or lift off.
Context Anchor
Seen in aircraft maintenance, paint preparation, corrosion control, and inspection of painted aircraft surfaces.
Derivation
Bonding comes from the Old English 'bond,' meaning a tie or fastening. In painting, it describes the way the paint film 'ties itself' to the surface beneath it.
Why Pilots Care
Poor paint bonding leads to peeling and flaking, which exposes the underlying metal or composite to corrosion, moisture, and UV damage. On aircraft, that is both a structural concern and an inspection issue.
Analogy
It is like a sticker on a clean window: if the window is clean, the sticker holds; if the surface is dirty or oily, it lifts off easily.
Intuition Check
Do not confuse paint bonding with electrical bonding. Here, bonding means the paint sticking firmly to the aircraft surface.
Example Sentence 1
The technician carefully cleaned and primed the aluminum skin to ensure good paint bonding before applying the topcoat.
Example Sentence 2
Proper paint bonding prevents corrosion from starting beneath the finish on aluminum surfaces.