Definition
A clear or pigmented lacquer finish that dries to a non-glossy, dull surface. Flatting agents are added to the lacquer so that when it cures, the surface scatters light rather than reflecting it, producing a matte appearance.
Plain English
A type of lacquer that dries with a dull, non-shiny finish instead of a glossy one.
Context Anchor
Seen in aircraft finishing, refinishing, and interior touch-up work where a non-shiny surface is wanted.
Derivation
‘Flat’ here is the painter’s sense of the word, meaning ‘without shine,’ not ‘level.’ ‘Lacquer’ comes from the Portuguese ‘lacca,’ a resin used for varnishes. Together: a lacquer finish made deliberately dull.
Why Pilots Care
Instrument panels and cockpit interiors are typically finished in flat lacquer (often flat black) to prevent glare and reflections that could obscure instrument readings or interfere with night vision.
Intuition Check
“Flat” does not mean the surface is level or horizontal here. It means the finish is dull or low-gloss rather than shiny.
Example Sentence 1
The instrument panel was refinished with flat black lacquer to reduce glare during daylight flying.
Example Sentence 2
Before covering the wings, confirm the approved flat lacquer meets the fabric coating requirements.