A mid-size vehicle may require a professional about 3 quarts of paint to paint. If you are inexperienced, two or three coats of paint on a car would require you to use about a gallon. This will require an additional amount of paint that you must purchase in advance. If you are painting your vehicle the same color, a gallon to a gallon and a half should work. If you are painting the vehicle a different color then it is best to go with a gallon and a half to 2 gallons. You will need more paint if you are painting the door jambs, under the hood, and the trunk. Also, if you put the paint in a spray mechanism, such as an airbrush, it will create twice the amount of paint.
Large vehicles: how much paint do I need to paint a car