WHAT BRUSH? Use a sash brush to paint the walls near the corners, ceiling and base molding. This process, known as “cutting in,” will make the job easier because these areas are hard to reach with paint rollers. My favorite brush is a Purdy nylon polyester 2.5 inch angled sash brush. For more tips, visit us on YouTube at “idahopainters”. See us on the web www.idahopainter.com