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CUT in one wall around woodwork, ceiling, inside corners and electrical boxes with a 3" brush. With the cut-in paint still wet, roll that wall with a 9" wide, 1/2" nap roller on a 9" roller frame. The wet cut-in paint should blend with the rolled areas to prevent "picture framing" or shadow lines at hand-painted/rolled junctions. Roll from top to bottom, from right to left, keeping the unsupported side of the roller frame pointing toward the left. Apply slightly heavier pressure to the unsupported side of the roller to eliminate roller tracks.
TIP
To speed up painting larger rooms, pour 1 or 2 gallons of paint into a 5-gallon bucket and use a roller screen instead of a roller tray.