I am preparing to paint the underside of a 72 Mustang Mach 1. The car is being restored to as close to concourse as possible. The underbody color is satin black with a slight greenish tint. I have been informed this is referred to a slop paint as it is a combination of exterior colors from production combined in a vat for painting the underside. Can you add a slight tint to the Extreme Chassis Black to obtain this slight greenish hue?