It depends on what color and what type of paint. A solid color will use less paint. My 37 took a gallon and a half to cover everything except the fenders and running boards. I used 2000 Honda Huntsman Green Pearl Metalic over a dark grey sealer. The paint was kinda thin so I had to really pile it on to get a good even coat with a good spray pattern. The black for the fenders will cover almost anything with one or two coats.