I used a combination of Rustoleum Red Oxide Primer and Rustoleum Camo Brown. I agree with BOILERMAKER1, just spray over everything and wipe off the tops of the rails with Acetone or Lacquer Thinner before the paint has time to dry. I know that I'm gonna get a bunch of "Po, Po" regarding the chemicals but I practice High Flow Ventilation, (several large fans) and I'm only using a small amount on cotton T-Shirt material wrapped around an appropriately sized piece of wood. Have a Look.
Chief Bob (Retired)