Definitions for "Overpainting"
a section of a painting added later, either by the original artist or by a later painter or restorer
A finishing layer over another layer of paint.
the final layer of paint that is applied over the underpainting or under layer after it has dried. The idea behind layers of painting is that the underpainting is used to define the basic shapes and design so that the overpainting can be used to fill in the details of the piece.