Rust Bullet

Joe,
I was at the beach, I was on the beach side just as you came into the marina. I had my 62 Valiant Wagon (Primer with the skeleton sitting in the drivers seat).
I'm working on my 67 Barracuda which is what I need the Rust bullet for. I just got most of the car sanded down to bare metal. working on the engine bay then I will be applying the RB but I need to figure out how much I need so I can buy it all. I was looking at getting the pint cans that way I can spray a can and then I can brush the rest without worrying about it drying just not sure if I need a gal or two.
Thanks to everyone for the assistance.
Ron