- Open the window, then paint the bottom, top, and side edges.
- Paint the frame casings and the crossbars.
- Paint the sill and the apron (the piece that extends below the sill)
- Lower the lower sash and raise the upper sash most of the way, leaving about a six-inch overlap. Paint the horizontal part on the bottom of the upper sash, then paint the sides of the upper sash as much as possible.
- Close the upper and lower sashes almost completely, and finish painting the upper sash.
- Paint the lower sash completely.
- Allow all of the paint to dry.
- Paint the window frame.
- Close the window, and paint all parts of the runners that are exposed. Be careful around sash cords, as paint on them could limit their ability to function.
- Paint the apron and sill.