$800.00 minimum for a single color metallic or solid color.
You bring the plastics and tank to your painter.
Materials can be very expensive. Fancy pearls, flakes, candies and color shift paints cost serious money and it takes experience to do it right. To me a polyurethane single stage black is breathtaking. The final finish is dependent on the surface prep. Orange peel in the final finish is the mark of an amateur.