Measure the space you intend to paint. Use the calculator listed in the Resources section to determine how many gallons you will need. Because you will only be applying one coat of the darker color, consider halving the amount.
Apply two coats of the lighter base coat with a roller brush and, as needed, use the 1-inch brush to cover corners. Allow the base coats to dry completely.
Apply the darker color to a section of the wall using a 3-inch brush. While wet, place a plastic sheet over the paint and smooth it over the paint with your hand.
Peel off the plastic sheet.
Repeat steps 3 and 4, overlapping each section with previous sections to prevent a gridlike appearance.