Pay particular attention to preparing the bottom of the frame to ensure the finished surface is as good as the rest. Clear away all flaking paintwork and dirt, right back to bare wood if necessary. Flaking and general deterioration are caused by moisture from condensation running down the glass and mixing with the dust that collects on the frame. Prepare this part of the frame well or it will only deteriorate soon after being repainted. Prime bare wood before using undercoat and gloss. Always brush about 3mm of paint onto the glass to prevent moisture getting into the putty and breaking it up. You may find it easier to use a cutting-in brush, specially angled for this job. Alternatives are a metal paint shield, which you rest on the glass at the correct distance from the frame, or masking tape.
If you use masking tape make sure to remove it while the paint is still tacky. If you leave it until the paint is dry you run the risk of pulling away the paint on the frame. The general rule for painting frames is to paint any surfaces which show inside the room when the window is open in the interior colour.
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