There was an older fellow I worked with as a teen who painted tank, boilers and smokestacks. I did it for a little bit, but sitting 400 ft in the air in bosun's chair and pulling yourself around with a rope hanging from the top while the wind swings you around makes you rather mow yards. Anyway, he had a Valiant station wagon that he painted with rollers and brushes with good hardened and thinned paint, and of course sanding, and you couldn't tell unless you got your nose right on it. I painted camo at the Marine Armory on their equipment by hand with area specific stencils and brushes/rollers. It went on just fine and sanded right out. You had to dull it so it wouldn't reflect. I did a bunch of trucks, a few tanks, and motor pool fighting recovery equipment that they shipped straight to the Fulda Gap for the Army in Germany.