- 1). Remove the original glass from the window. The only requirement is to be cautious while removing the old glass. Pry out the original glazier's points, which are small metal strips pressed into the edges of the window frame to hold the window in place. Scrape off any residual glazing putty or compound with the 5-in-1 painter's tool.
- 2). Clean the window frame with a stiff-bristled scrub brush to remove paint and debris. The surface needs to be smooth and free of any chunks, nails, or staples.
- 3). Measure the cleaned surface for width and height. Subtract 1/8th of an inch from each measurement. Transfers the measurements to a glass panel and mark the dimensions with a dry-erase marker. Place the marked panel on a flat surface.
- 4). Hold a straightedge tool, such as a strip of wood or level, against the glass firmly with the edge of the tool lining up to the marks made in Step 3. Drag the glass cutting tool along the edge of the straightedge to cut the glass. Pull the tool lightly across the surface to create a small groove. Repeat the process several times until the groove sits approximately halfway through the glass.
- 5). Slide the glass so that the groove sits along the edge of flat surface. Carefully bend the glass downward over the edge of the surface to break the glass along the groove. Repeat the process for the second cut.
- 6). Apply a bead of silicone window sealant around the perimeter of the window frame where the glass will sit. Place the piece of glass into the frame. Press glazier's points against the glass so that the pointed end of the points is angled towards the window frame. Push the points into the frame with the tip of the 5-in-1 tool so that the glass is firmly held in place. Place at least one or two glazier's points on each edge of the glass.
- 7). Knead some glazing putty by hand until warm. Roll the putty into a string approximately 1/4 inch thick and as long as the width or height of the glass. Press the putty against the seam where the glass meets the frame. Smooth the putty over by dragging a moistened finger down the length or across the width of the putty so that it blends into the frame. Repeat for the other three sides. Allow the putty to dry and sand as needed.
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