内涂层

• undercoat

例句

1. 我要把原有的油漆全部铲去，并要涂上新的内涂层和上光剂。我要彻底地干一下，决不马马虎虎。
   I want all the existing paint stripped off and new undercoat and gloss applied. I want a thorough job, with no half measures.