I worked for a body shop supply store for several years after high school in the 80's. One time I had one of the painters actually bring the Mustang he had just painted the quarter on to the store to show me my mistake. I had mixed him Centari acrylic enamel for this silver Mustang, but wrote the formula down wrong, and added a couple parts of green rather than black. He was a great guy, but mad that day. It was a green quarter against a silver door, but you could not see the blend on the sail panel at all! It can be done, and there are a couple jobbers that still have PPG Delstar mixing tints. I'm kicking around painting my B7 car in single stage so the color would be right.