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English definition of “undercoat”

undercoat

noun [C or U]     /ˈʌn.də.kəʊt/ US  /-dɚ.koʊt/
a first layer of paint that is put on a surface in order to improve the appearance of the final one, or the paint used for this: Those red walls will probably need two undercoats. → Compare topcoatPaints, dyes and pigmentsColour - general wordsCoverings and layers
(Definition of undercoat noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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