Skim coats refer to a type of plaster or stucco layer that is applied thinly over a wall or ceiling surface. Skim coats are often used to create a smooth, even surface for painting or wallpapering. Synonyms for skim coats include "finish coats," "top coats," "troweled finishes," and "veneer plaster." Other related terms in the construction industry include "leveling coats," "scratch coats," and "base coats," which are applied before the skim coat to provide a base for the finishing layer. Regardless of the terminology used, the goal of using these coatings is to create a polished, seamless finish on interior or exterior walls and ceilings.