Ethan Clarke
Glazing a plastic window is a straightforward process that can be completed with the right tools and some patience. Glazing putty is a common material used for window glazing, but it is not suitable for plastic windows as it does not adhere properly to the surface. Instead, you can use products like Liquid Nails Window Glazing, which is designed for use on plastic glass, or opt for 1/4 acrylic sheets as a glazing alternative. With the right products and careful application, you can effectively glaze a plastic window and maintain its clarity and functionality.
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What You'll Learn
Removing the window sash
To remove the window sash, you will need a screwdriver and a putty knife. If you are working with a heat gun, wear leather gloves and protective eyewear.
First, take out the stops. These are the vertical bars inside the window frame in front of the sash. Use a screwdriver to remove them and place them aside. Then, press the jam liners (the grooved side pieces that guide the sash up and down the frame) into the wall.
Now, carefully pull the sash out of the frame by tilting the top outward. If you are working with an upper sash, you will need to first remove the parting beads, which are the small vertical rails in the frame between sashes.
Finally, use a putty knife to remove any remaining glazing points or spring clips holding the glass in place. Slip the putty knife underneath each point and pry up slightly before pulling them out with needle-nose pliers.
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Using a heat gun to soften old glaze
When glazing a plastic window, you will need to remove the old glaze before you can apply the new one. One way to do this is by using a heat gun to soften the old glaze. Here is a step-by-step guide on how to do this:
First, put on some protective gear, including leather gloves and safety goggles, to shield your hands and eyes from any flying debris. Place a cloth or towel underneath the window to catch any falling putty or glass shards.
Next, hold the heat gun approximately 3 inches (7.6 cm) above the glass for 15 to 30 seconds to soften the old glaze. Keep the heat gun moving constantly to avoid concentrating heat in one spot, as this could cause the glass to crack. If your heat gun doesn't have a heat shield attachment, protect the glass with a thin sheet of metal or even some folded-over aluminium foil.
Once the glaze has softened, use a stiff putty knife to gently pry out the old glazing. Be careful not to use sudden, sharp movements, as this can damage the frame or glass. If the putty is badly cracked, you can quickly pry away large chunks. However, putty in good condition will take longer to remove and will require more softening with the heat gun.
After removing the old glaze, you can continue with the next steps in the glazing process, such as cleaning the frame and applying the new glazing compound.
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Applying a new glaze
The first step is to prepare the window frame by removing the old glaze and cleaning the surface. If the window is still in place, you can use a putty knife to pry away large chunks of old glazing compound. For more precise removal, especially in tight spaces, use a heat gun to soften the glaze and then scrape it out with the putty knife. Be careful not to damage the frame or glass with sudden, sharp movements.
Once the old glaze is removed, you can prime the window frame if necessary. If you are working with a wooden frame, use a shellac-based primer or an oil-based primer, especially if you live in a humid area. Let the primer dry according to the manufacturer's instructions.
Now, you are ready to apply the new glaze. Choose a glazing compound that is suitable for your project, either oil-based or latex/acrylic. Oil-based compounds provide a neater finish and are better for clean results, but they take longer to dry. Latex compounds are quicker to dry and can be left unpainted, but they may not last as long. If using an oil-based compound, ensure it is at room temperature and knead it with your hands to soften it before application.
Apply a generous layer of the glazing compound to the window frame, ensuring you completely fill the recess and create an airtight seal. Use a putty knife to smooth out the compound and create a smooth surface. Dip the knife in mineral spirits to lubricate it and run it over the compound as many times as needed. If using an oil-based compound, you can heat the can in a bowl of hot water to make it easier to work with.
Finally, clean up any excess compound and residue with a damp rag before it starts to set. Allow the new glaze to dry thoroughly before painting, following the manufacturer's instructions for drying times.
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Smoothing the glaze with a putty knife
There are different types of putty knives available, each serving specific purposes. For smoothing glaze, a flexible putty knife with a thin, flat blade is recommended. This type of knife bends easily and provides the necessary maneuverability for smooth and even applications. It is perfect for working on uneven surfaces or curved window frames. The blade is typically made of durable materials such as stainless steel, which ensures longevity and resistance to corrosion.
Before using the putty knife to smooth the glaze, it is important to ensure that the frame and glass are clean and free from dust, dirt, or old putty. This will help achieve a smooth and even finish. Hold the knife at a 45-degree angle and apply light pressure as you work your way along the frame. The goal is to create a smooth, clean surface that looks professional and provides a secure seal.
If you are using an oil-based glazing compound, it is recommended to dip the putty knife in mineral spirits to lubricate it before smoothing. This will help the knife glide smoothly across the compound. Additionally, oil-based putty should be at room temperature and kneaded like bread dough before application. You can also add a small amount of canola oil to the compound as you knead it to make it more pliable and allow the knife to move across smoothly.
After smoothing the glaze, there may be excess compound along the edges of the frame. Use the putty knife to gently trim away this excess material, creating clean lines and a polished finish. Remember to clean the knife and any remaining putty residue from the window frame using a rag and a solvent such as turpentine or mineral spirits.
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Painting the glaze
Oil-based glazing compounds, on the other hand, must be painted over with an oil-based paint or primer but only after they are fully dried, which can take several weeks. This is because oil-based compounds take longer to dry and cure. If you are using DAP '33' Glazing, for example, you should wait at least seven days after application, but more likely two to three weeks, before painting with an oil-based paint or primer.
It is important to note that window glazing should not be used on plexiglass or plastic glass as it will not adhere properly. There are, however, some DIY glazing products that are specifically designed for use on plastic glass, such as Liquid Nails Window Glazing. Unfortunately, this product has been discontinued, but there may be other similar products available.
When painting the glaze, it is important to follow the manufacturer's instructions for the specific product you are using. It is also important to take the necessary safety precautions, such as wearing gloves and eye protection, and to ensure that the area is well-ventilated.
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Frequently asked questions
Glazing is the putty material that insulates the space between a glass pane and the window frame. It is critical for blocking air leaks and making your home quieter.
Glazing a plastic window is slightly different from glazing a glass window. While glazing compounds are used for glass windows, some DIY products like Liquid Nails Window Glazing can be used for plastic glass.
You will need a heat gun, a stiff putty knife, a hammer, heavy gloves, eye protection, and a cloth. You may also need a scraper, a screwdriver, and needle-nose pliers.
Glazing compounds come in oil-based and latex/acrylic varieties. Latex glaze dries in about 3 days and doesn't need to be painted over, but it doesn't last as long. Oil-based glaze takes several weeks to dry but is better for neat results.
Apply a heavy layer of glazing compound to the perimeter of the glass, filling any gaps or hollow spots. Smooth out the compound with a putty knife dipped in mineral spirits. Remove any excess compound and clean any residue on the glass.
