The term 'THIN COAT' can be broken down into two crossword solutions: FILM (4 letters) and VENEER (6 letters). A FILM is a thin layer of material, such as paint or plastic, that covers a surface. It can also refer to a thin layer of gas or liquid, such as a coating of oil on water. VENEER is a thin layer of wood or other material used to cover the surface of an object. It is often used to give furniture a more attractive appearance.