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Working in small areas (about 1' by 2'), first use a 4" brush dipped in water to dampen the wall slightly so the acrylic paint won't dry too quickly. Squeeze a small amount of each of the acrylic paints, from lightest to darkest, onto a palette or a scrap of molding. Starting with the lightest color, use an artist's fine-point brush to apply tiny random dots to the dampened area. Cleaning the brush with water between colors, continue until the entire area has been dotted with color. Be sure to use the darkest color very sparingly -- dark tones can very easily dominate a space.
Dampen the 4" brush slightly and begin "dragging" the spots. Use a very light touch as you push down with the brush, then drag, trying to work at a 45-degree angle. There's no right or wrong way to do this. Just use the tips of the bristles and a light touch. Work all the way to the chair rail, brushing right over the tape at that point. Continue this technique until the entire top half of the room if finished.