While going to school for automotive collision repair/paint I've seen people who have NEVER painted a car before make a car come out 100x better than that.
Repaint the man's car. (using another painter/prep). Send it to maaco (bc you obviously can't handle an all-over paint job.)
color matching isn't hard either, take a sample to the paint store and they will scan it with there computers and come up with an exact match. (i've done this with multple cars with different color paints)
Even if he did sign the papers, do you not have pride in what you send out of your shop? I sure as hell wouldn't be proud of those 2 cars, matter of fact if ANY cars came out of my shop like that I would personally quit doing this type of work and rethink my career.
