Poor Flow /Levelling: Failure of paint to dry to a smooth film, resulting in unsightly brush and roller marks after the paint dries. Possible causes: Use of low quality paint. Application of additional paint to “touch up” partially dried painted areas. Use of the wrong type of roller cover or poor quality brush. Remedy: Use top quality water-based paints, which are generally formulated with ingredients that enhance paint flow. Brush and roller marks thus tend to “flow out” and form a smooth film. When using a roller, be sure to use a cover with the recommended nap length for the type of paint being used. Use of a high quality brush is important ; a poor brush can result in bad flow and leveling with any paint.