I used a gallon and a quart for my 3100 pickup and have just a dab left. There's no way I'd consider painting my interior Omaha Orange. LOL!

I would imagine that 1-1/2 gallons would be enough for the exterior of a panel, like Phil said.

Also, don't buy the paint real early, as some paint has a shelf life.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.