Following that, we then close the window by about 95%, attempting to preserve the homeowner's inside temperature while leaving the freshly painted surfaces free to dry. We then paint the remainder of the window as usual, taking a special effort to dry-brush the edges of each sash while cutting a straight line along the edge of each sash where they meet the track; doing so minimizes the amount of paint allowed to contact the edge of track, which is what causes windows to be painted shut. At the end of the day, after it has fully dried and had several hours to cure, the homeowner is asked to close and lock their windows from the inside. This shutting of the window after drying ensures a final movement of the windows, resulting in a neatly painted window that is not painted shut, pictured below (touch/click to see full size). Before paying a painting contractor, always verify for yourself that your windows have been fully painted (even the hidden parts) and are still functional.