Written by

Danny Neill

How To Seal Window Frames

Enhancing Window Frame Longevity and Efficiency Through Proper Sealing

Maintaining the integrity and efficiency of window frames is crucial in building management, impacting everything from energy conservation to interior comfort.

Properly sealed window frames guard against environmental elements, prevent moisture ingress that can lead to mold and wood rot, and help maintain indoor temperature regulation.

This guide will provide you with a detailed methodology for sealing your window frames using state-of-the-art products designed for maximum durability and performance, particularly focusing on high-quality, weatherproof, and UV-resistant silicone sealants like Silirub LMN or Silirub 2, or Hybrid Sealants like Soudaseal 215LM or Fix All Flexi.


Product Selection

Choosing the Right Tools and Materials for Effective Sealing

To ensure that your window sealing project is successful, it is essential to start with the right tools and materials. Here’s a detailed list of what you’ll need and why each item is important:

  • High-Quality Sealant: Opt for Silirub LMN or Silirub 2. These silicone sealants provide exceptional weather resistance and flexibility, making them ideal for sealing various window frame materials including wood, aluminum, and PVCu. Alternatively, Hybrid Sealants like Soudaseal 215LM and Fix ALL Flexi can be used.

  • Caulking Gun: A reliable caulking gun is indispensable for applying sealant evenly and efficiently. A good quality gun will allow better control of the sealant flow, reducing waste and ensuring a smooth application.

  • Soudaglatt Flexible Smoothing Tool: This tool helps achieve a professional-grade finish by smoothing the sealant neatly along the joints, eliminating bumps and gaps. Alternatively, a wetted fingertip may be used.

  • Safety Cutter: A safety cutter is necessary for safely opening the sealant cartridges and precisely cutting the application nozzle to match the joint width.

  • Masking Tape: Masking tape helps protect the areas around the sealant line and ensures that any excess sealant does not spread onto the window panes or wall, making cleanup easier.

  • Cleaning Supplies: Including a high-quality cleaner and degreaser such as Soudal Cleaner & Degreaser or Soudal Foam Action Multi Cleaner, along with a clean cloth, to ensure the window frames are free of dirt, grease, and debris before application.

  • Soapy Solution and Hand Pressure Sprayer: These are used for final cleaning and smoothing steps, helping to ensure that the sealant adheres well and leaves a clean, professional appearance.

By meticulously selecting and using these products, you can enhance the effectiveness of your window sealing project, ensuring long-lasting protection and aesthetic appeal.



Ensuring the Surface is Ready for Sealing

Proper preparation of the surface where the sealant will be applied is critical to the success of your sealing project. Here are the steps to prepare your window frames and adjoining surfaces:

  1. Clean and Dry the Window Frame and Wall: Start by brushing away any loose dirt, dust, and debris from the window frame and adjacent wall area. Use a high-quality cleaner like Soudal Cleaner & Degreaser or Soudal Foam Action Multi Cleaner to remove any greasy spots or buildup. Wipe these areas with a damp cloth and then allow them to dry thoroughly. A clean and dry surface ensures that the sealant will adhere properly and last longer.

  2. Tape off the Joint Edges: Apply masking tape to both sides of where the sealant will be applied. This not only helps in achieving a straight and professional-looking line but also protects the surfaces adjacent to the sealant line. Ensure that the joint gap where the sealant will be applied is consistently between 5 and 10 millimeters wide. Proper taping allows for cleaner work and easier cleanup.

Applying Masking Tape to Tape Off Joint Edges 


Sealant Application Process

Applying the Sealant for Durable and Effective Sealing

Once the surface is prepped, follow these steps to apply the sealant correctly:

  1. Open the Cartridge: Use the safety cutter to snip the top off the sealant cartridge. Attach the nozzle, and cut it at a slant, proportionate to the joint size you are working with, to facilitate an even application.

  2. Insert the Cartridge into the Caulking Gun: Place the sealant cartridge into the caulking gun. Squeeze the trigger a few times until the sealant starts to emerge from the nozzle. This ensures that the sealant is ready for application without any air gaps.

  3. Start Sealing: Position the nozzle at the start of the joint and gently squeeze the trigger of the caulking gun. Move along the joint in a steady, controlled manner. Make sure to apply an even layer of sealant, filling the joint completely without overfilling it.

  4. Smooth the Sealant: Lightly spray the freshly applied sealant with a soapy solution. Use the Soudaglatt Smoothing Tool or a wet finger (wearing a latex glove for protection) to smooth the sealant into the joint. This step is crucial as it not only helps in shaping the sealant for a neat finish but also ensures that it fully bonds to the surface of the window frame and wall.

  5. Remove the Tape and Clean Up: While the sealant is still wet, carefully remove the masking tape. This should leave a clean, sharp line of sealant along the joint. If necessary, smooth the line again to ensure there are no bumps or divots. Finally, use a hand pressure sprayer filled with clean water to rinse the area, removing any soapy residue.



Additional Tips and Advice

  • Adherence to Weather Conditions: It is important not to apply sealant in wet or very cold conditions. The best results are achieved on dry days with mild temperatures.

  • Colour Selection: Choose a colour of sealant that closely matches the window frame or wall to create a seamless appearance. If you are unsure about the colour, test a small amount on an inconspicuous area before proceeding.

  • Avoiding Stains on Sensitive Materials: If you are working around materials like natural stone that may stain, consider using a sealant that specifies it is safe for such surfaces, like Soudaseal 215LM or Fix All Flexi.

This detailed approach not only helps in achieving a high-quality seal but also extends the life of your window frames, ensuring they continue to enhance the aesthetic and energy efficiency of your property.


Maintenance and FAQs

Keeping Your Window Seals in Top Condition

Maintaining your newly sealed windows ensures their longevity and continued performance in energy efficiency and moisture protection. Here are some maintenance tips and answers to frequently asked questions about window sealing:

  • Regular Checks: Inspect sealed joints at least once a year for signs of wear, such as cracking or peeling. Harsh weather conditions can accelerate the aging process of sealants.

  • Reapplication: If you notice any damage or degradation in the sealant, clean the affected area thoroughly and apply new sealant as needed. This helps preserve the integrity of the window frame and prevents more extensive repairs.

  • Cleaning: Gently clean the sealed areas with a soft cloth and mild detergent. Avoid using abrasive cleaners or brushes that can damage the sealant.


Frequently Asked Questions
Q) How often should I reseal my window frames?

A) Typically, window frames should be resealed every 5 years, depending on the exposure to weather elements and the type of sealant used.


Q) What is the best time of year to apply sealant?

A) The ideal time for applying sealant is during dry weather with moderate temperatures, generally in late spring or early fall.


Q) Can I apply new sealant over old sealant?

A) It is best to remove old sealant completely before applying a new layer to ensure the best adhesion and effectiveness. To remove old sealant, you can use Soudal Silicone Remover Gel or Soudal Sealant Remover Spray to aid effective removal.


    Platinum Chemicals - Providing High Quality Products and Inspiring Confidence.

    Platinum Chemicals are one of the Leading UK Stockists of Soudal Sealants, Expanding Foams and Adhesives.

    At Platinum Chemicals, we pride ourselves on providing an excellent service every time, with bulk discounts and speedy delivery available.

    You can buy from Platinum Chemicals with confidence you’re getting the best products at excellent prices every time. If you require advice on these products please contact us on 01355 222777.


    Securing and Beautifying Your Property with Proper Window Sealing

    Sealing window frames is not just a task; it’s an essential maintenance step that enhances your property’s durability, aesthetics, and energy efficiency. With the right products, like Silirub LMN, Silirub 2, Soudaseal 215LM or Fix ALL Flexi and by following the detailed steps provided in this guide, homeowners and property managers can achieve professional-level results.

    Remember, the effectiveness of your sealing project lies in the quality of the products used and the precision of the application. For those looking to purchase top-quality sealants, Platinum Chemicals offers a wide range of products that ensure reliability and customer satisfaction.

    By taking the time to correctly seal your window frames, you not only protect your investment but also contribute to a more energy-efficient and visually appealing home or building.

    If you require further assistance or need advice on the best products for your specific needs, feel free to reach out to the experts at Platinum Chemicals. With their extensive selection and commitment to quality, you’re guaranteed to find the perfect solution for your sealing projects.

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