Roller Marks/ “Stipple”: Unintentional textured pattern left in the paint film by the roller. Possible causes: Use of incorrect roller cover. Use of low grades of paint. Use of incorrect rolling technique. Remedy: Use the proper roller; avoid too long a nap for the paint and the substrate. Use quality roller to ensure adequate film thickness and uniformity. High quality paints tend to roll on more evenly due to their higher solids content and leveling properties. Pre-dampen roller covers used with water-based paint; shake out excess water. Do not let paint build up at roller ends. Begin rolling at a corner near the ceiling and work down the wall in sections. Spread the paint in a zigzag “m”or “w” pattern, beginning with an upward stroke to minimize spatter; then, pattern with even, parallel strikes. If rolled, lay off with a brush.