To apply paint primer, use a roller to paint 3-foot-square sections with V-shaped or W-shaped strokes. Use a primer that is tinted to a shade similar to the top coat to reduce the number of coats necessary to cover a wall.Continue Reading
Fill any cracks or holes with spackling compound, and allow the areas to dry. Smooth the areas with 220-grit sandpaper before priming.
Use painters tape to mask off any areas you do not wish to prime, such as ceilings or baseboards. Press the tape firmly to keep the primer from bleeding through the edge.
Work from the top to the bottom of the wall, and move across the wall as you complete each vertical area. Paint a 3-foot-square section at a time, using a V-shaped or W-shaped stroke to avoid streaks. As you begin work on a new section, allow your strokes to overlap the edge of the previous section.