I have a tan dash I want to change to black. Also I am changing a pair of seats from red to black. I intend to paint the plastic panels on the seats, not the vinyl itself. I am re-upholstering the seats. I watched Fbodywarehouse's video on dyeing interior panels. Basically clean with acetone, spray color, then clear coat in a satin. Anything else to consider? How many cans of paint and clear will I need? Thanks all.