The crossword solution for the term 'THIN COAT OF PAINT' is WASH, which is a four letter word. Washing is a process of cleaning surfaces with water and detergent to remove dirt, dust, and other contaminants. It is often used in combination with other techniques such as sanding and scraping to prepare surfaces for painting. A thin coat of paint is a layer of paint that is applied thinly to a surface, usually to provide a protective coating or to enhance the appearance of the surface.