Overpainting

Overpainting can mean the final layers of paint, over some type of underpainting, in a system of working in layers. It can also mean later paint added by restorers, or an artist or dealer wishing to `improve` or update an old image—a very common practice in the past. The underpainting gives a context in which the paint-strokes of the overpaint.....
Found on http://en.wikipedia.org/wiki/Overpainting

Overpainting

Restoration requiring in painting where the restorer does not have skill enough to retouch within the damage area alone without having to extend the restored area substantially beyond the boundaries defined by the damage.
Found on http://www.art-conservation.org/GLOSS_Paint.htm
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