Definition
A chemical additive (a drier) blended into oil-based aircraft paint to accelerate the oxidation and curing of the paint film after application. Paint dryers are typically metallic compounds, such as cobalt, manganese, or lead salts of organic acids, that catalyze the reaction between the paint's oil binder and atmospheric oxygen so the coating hardens in a usable timeframe.
Plain English
A small amount of chemical added to paint to make it dry and harden faster after it is sprayed or brushed onto an aircraft.
Context Anchor
Seen in aircraft maintenance and refinishing work when a painted surface must dry properly before the aircraft or part is handled, assembled, or returned to use.
Derivation
From 'paint' plus 'dryer,' meaning an agent that causes drying. In the coatings industry, 'drier' (also spelled 'dryer') has long referred specifically to a catalyst added to oil-based paints, not to a heating device. Knowing this prevents confusion with a machine or oven.
Why Pilots Care
Paint that has not dried correctly can stay soft, collect dirt, peel, or be damaged during handling. In maintenance, the correct dryer and drying time help protect the aircraft surface and avoid poor finish quality.
Intuition Check
A paint dryer is not usually a machine that blows hot air on paint. In this context, it means a material added to the paint to help it dry faster.
Example Sentence 1
The shop added a paint dryer to the enamel so the fuselage finish would cure overnight instead of over several days.
Example Sentence 2
After the primer was sprayed on the fuselage, the crew activated the paint dryer to prepare the surface for the final color coat.