Install glazing points every 4-6 inches around the glass perimeter. Press the point of the triangle into the side of the rabbet, then use a stiff putty knife to press the point into the wood.
Open a can of window putty and remove a large glob. Work the putty in your hands to warm and soften it a bit. Then roll the putty ball between you hands to form a rope that is about 3/8 inch in diameter.
Lay the putty rope into the rabbet and use the putty knife to push the putty into the rabbet. As you do this, press the putty knife against the glazing putty at a 45-degree angle. When you have worked your way around the window, place the edge of the putty knife against the glass and push the blade against the window frame. Pull the putty knife over the putty to smooth it and cut away the excess putty. Then go back and scrape any putty off the glass with the knife.
When the putty has formed a skin, apply a coat of exterior primer over it. When the primer has dried, apply a coat of exterior trim paint.
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