undercoat

noun
🔊/ˈʌndəkəʊt/
🔊/ˈʌndərkəʊt/
[countable, uncountable]
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  1. a layer of paint under the final layer; the paint used for this底涂层;内涂层;底层涂料
    • Apply the undercoat first.首先涂底漆。
    compare topcoat