Many homeowners think painting is just about choosing a color. In reality, the quality of a paint job depends heavily on what happens before the paint goes on. One of the most important — and most misunderstood — steps is skim coating. What Is Skim Coating? Skim coating is the process of applying a thin layer of joint compound to walls or ceilings to create a smooth, even surface. Once it dries, the surface is sanded and prepped for paint. It’s not always necessary — but when