For a smooth finish on large wall and ceiling areas, paint in small sections. First use a paintbrush to cut in the edges, then immediately roll the section before moving on. If brushed edges dry before the area is rolled, lap marks will be visible on the finished wall. Working in natural light makes it easier to spot missed areas.
Choose high-quality paint and tools and work with a full brush or roller to avoid lap marks and to ensure full coverage. Roll slowly to minimize splattering.
Paint ceilings with a roller handle extension. Use eye protection while painting overhead. Start at the corner farthest from the entry door. Paint the ceiling along the narrow end in 3 × 3' sections, cutting in the edges with a brush before rolling.
Apply the paint with a diagonal stroke. Distribute the paint evenly with back-and-forth strokes. For the final smoothing strokes, roll each section toward the wall containing the entry door, lifting the roller at the end of each sweep.
Paint walls in 2 × 4' sections. Start in an upper corner, cutting in the ceiling and wall corners with a brush, then rolling the section. Make the initial diagonal roller stroke from the bottom of the section upward, to avoid dripping paint. Distribute the paint evenly with horizontal strokes, then finish with downward sweeps of the roller. Next, cut in and roll the section directly underneath. Continue with adjacent areas, cutting in and rolling the top sections before the bottom sections. Roll all finish strokes toward the floor.