There are several synonyms for the word "overpaint" that can be used depending on the context and tone of the sentence. Some of the commonly used synonyms include "repaint," "touch up," "restore," "refurbish," and "reapply." All these synonyms are used in reference to the application of another layer of paint on a surface that already has a coat of paint. However, some of these synonyms also imply different levels of work. For example, "restore" and "refurbish" are used to imply a complete makeover, while "touch-up" and "reapply" refer to a minor or partial application of paint.