Window panes sit inside frames made from a variety of materials. The panes of glass are sealed to the frame using a silicone or other type of sealant. Over time, this seal can break down, crack, be pulled away, or otherwise damaged. This can lead to air leaks which can cost a lot of money in heating and cooling costs. There is no need to call in a professional for this job; this one you can do yourself.
Clean the edge where the glass and frame meet. Pass a wire brush along the surfaces of the frame and the glass to clean any old sealant, paint, dirt or grime from the surfaces. Use the putty knife for any larger objects stuck to the surface.
Use your putty knife to cut the tip off your silicone sealant tube by placing the tip against a hard surface and pressing the knife against the tip. The closer to the tip you cut, the smaller the opening; start small and cut away more if a larger opening is required.
With the tube in the caulking gun, place the tip of the tube along the edge where the window frame and glass meet. Pull the trigger and move the tip around the window dispensing an even bead of silicone along the edge. Stop when you have reached the start of your bead.
Use your finger to smooth the bead of silicone to the window frame and glass creating a smooth, uniform, continuous seal around the window.
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