Seal the Deal: The Best Window Sealants for Every Budget

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Window sealants are an essential part of any home or building’s maintenance routine. They prevent air, water, and noise from penetrating through the gaps between the window frame and the wall, ensuring that the interior remains comfortable and energy-efficient. The right window sealant can also help to improve the overall appearance of the property by filling in any unsightly gaps and cracks.

When it comes to choosing the best window sealant, there are several factors to consider. One of the most critical things to consider is the type of material used in the sealant. Some sealants are made from silicone, while others are made from acrylic or polyurethane. Each material has its own unique properties, and it’s essential to choose the one that is best suited for your needs.

Another factor to consider is the size of the gaps or cracks that you need to fill. Some sealants are better suited for small gaps, while others can be used to fill larger gaps and cracks. It’s also important to consider the drying time of the sealant, as some products can take several hours or even days to dry completely.

At Door and Window Guide we spent hours researching and testing various window sealants to identify the ones that offer the best performance for DIY’ers and value for money. In the following sections, we’ll take a closer look at some of the top-performing window sealants on the market, and provide you with all the information you need to make an informed purchase decision.

Best Window Sealants

As homeowners, we know the importance of having a good window sealant. It not only keeps the outside elements from entering our homes but also helps with insulation and energy efficiency. With so many options on the market, it can be overwhelming to choose the right one.

That’s why we’ve done the research and testing to bring you the best window sealants available in the UK. Our roundup includes sealants that are easy to apply, long-lasting and provide a strong seal. Read on to find the perfect sealant for your windows.

Rapide Window, Frame & Door Acrylic Sealant

Rapide Window, Frame & Door Acrylic Sealant

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If you’re looking for an affordable and reliable window sealant, the Rapide Window, Frame & Door Acrylic Sealant is a great option. We highly recommend this product for its strong and lasting application that can withstand any gap, crack, or fracture.

Pros

• Once applied, the sealant provides approximately 10-11 meters, making it a great buffer for all gaps, cracks, and fractures that have developed.
• It’s great around door, window frames, skirting boards, etc. You can expect to reuse our cartridge as it is a large 280ml.
• The sealant is paintable water-based acrylic sealant for sealing internal joints. Choose the correct cartridge of your task, Brown, or White.

Cons

• The sealant dries very firm, almost to a filler-like consistency, which means it can pull off from an edge.
• It may take some time to fully cure, but once it does, the sealant is strong and long-lasting.
• The product specifications are not clearly listed.

We found that the Rapide Window, Frame & Door Acrylic Sealant is quick-drying and effective, allowing you to get your project finished in no time. Once fully cured, the sealant is strong and provides a great buffer for all gaps, cracks, and fractures that have developed. We also appreciate that it’s paintable, allowing you to match the color of your window or door frames.

One downside is that the sealant dries very firm, almost to a filler-like consistency, which means it can pull off from an edge. However, removing the sealant if required is easy. Additionally, the product specifications are not clearly listed, which can make it difficult to determine if it’s the right product for your needs.

Overall, the Rapide Window, Frame & Door Acrylic Sealant is a reliable and affordable option for those looking to seal their windows or doors. Its strong application and paintable finish make it a great choice for any DIY project.

UniBond Outdoor Extreme Repair Sealant

UniBond Outdoor Extreme Repair Sealant

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If you’re looking for a reliable and long-lasting sealant for your outdoor sealing jobs, UniBond Outdoor Extreme Repair Sealant is the perfect solution.

Pros

• This sealant is permanently flexible, providing a durable and flexible perimeter seal for exterior window and door frames, protecting you from the elements.
• It can be used on various materials such as wood, uPVC, polycarbonate, and metal, making it suitable for most window and door frames.
• As well as providing strong and flexible sealing, this window frame sealant is also waterproof, so it can stand up to harsh weather conditions.

Cons

• The price of this sealant is a bit higher compared to other brands.
• It may take a bit longer to dry than other sealants, but it’s worth the wait for its long-lasting durability.
• The cartridge may not be as easy to handle as some other types of sealants.

We recently used UniBond Outdoor Extreme Repair Sealant to fix a leaky window frame, and we were impressed with the results. The sealant provided a strong and flexible seal that has held up well against the elements. It was also easy to apply, and the cartridge provided a good amount of sealant for the job.

One thing to keep in mind is that this sealant may take a bit longer to dry than other brands, so be sure to allow enough time for it to set before painting or exposing it to water. However, the long-lasting durability of this sealant makes it well worth the wait.

Overall, if you’re looking for a high-quality sealant that will stand the test of time, UniBond Outdoor Extreme Repair Sealant is definitely worth considering. Its flexibility, waterproofing, and multi-material compatibility make it a great choice for any outdoor sealing job.

Gorilla All Conditions Sealant Silicone White 295ml White 1 Pack Cartridge

Gorilla All Conditions Sealant Silicone White 295ml White 1 Pack Cartridge

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If you’re looking for a window sealant that is fast-setting and repels mould and mildew, then the Gorilla All Conditions Sealant Silicone White 295ml White 1 Pack Cartridge is a great option to consider.

Pros

• The fast-setting formula allows you to expose the sealant to water after just 30 minutes, making it a great option for areas that are prone to moisture.
• The long-lasting performance ensures that the sealant repels mould and mildew, making it ideal for use in bathrooms and other damp areas.
• The multi-surface formula makes it versatile and suitable for use on a range of materials, including porcelain, metal, vinyl, laminate, stone, ceramic, stainless steel, granite, wood, and glass.

Cons

• The sealant may not be suitable for use on certain types of plastic, so it’s important to check the compatibility before use.
• The nozzle can be difficult to control, which can make it challenging to apply the sealant neatly.
• The sealant may not be suitable for use in areas that are exposed to direct sunlight, as it may yellow over time.

We recently used the Gorilla All Conditions Sealant Silicone White 295ml White 1 Pack Cartridge to seal the windows in our bathroom. We were impressed with how quickly the sealant set, allowing us to use the shower again within just a few hours. The sealant also repelled mould and mildew, which is a common problem in our bathroom due to the high humidity levels. We appreciated the fact that the sealant was suitable for use on a range of surfaces, as we were able to use it on both the tiles and the window frames.

However, we did find that the nozzle was quite difficult to control, which made it challenging to apply the sealant neatly. We also noticed that the sealant had yellowed slightly in areas that were exposed to direct sunlight, which was a little disappointing. Overall, we would recommend the Gorilla All Conditions Sealant Silicone White 295ml White 1 Pack Cartridge for its fast-setting formula, long-lasting performance, and versatility.

EVO-STIK Window & Door Frame Sealant

EVO-STIK Window & Door Frame Sealant

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If you’re looking for a sealant that can keep out water and draughts, then EVO-STIK Window & Door Frame Sealant is a good choice for you. It has excellent adhesion to most materials, including wood, uPVC, and metal, making it suitable for both interior and exterior use.

Pros

• The sealant is weatherproof and prevents damage caused by water penetration.
• It contains a fungicide that combats unsightly mould growth.
• It’s overpaintable when dry, so you can match it to your decor.

Cons

• The sealant can be a bit messy to apply, so you’ll need to be careful.
• It may not be suitable for use on certain materials.
• The sealant can take a while to dry completely.

We recently used EVO-STIK Window & Door Frame Sealant to seal around our new windows, and we were impressed with its performance. The sealant was easy to apply, although we did need to be careful as it can be a bit messy. Once applied, the sealant dried quickly, and we were able to paint over it within a few hours.

One thing to note is that the sealant can take a while to dry completely, so you’ll need to be patient. However, once it’s dry, it provides a strong, flexible seal that keeps out water and draughts. We also appreciated the fact that the sealant contains a fungicide that prevents mould growth, which is a common problem in bathrooms and other damp areas.

Overall, we would recommend EVO-STIK Window & Door Frame Sealant if you’re looking for a reliable, long-lasting sealant that can keep out water and draughts. It’s easy to apply, overpaintable, and contains a fungicide to combat mould growth. Just be prepared for a bit of messiness during application, and allow plenty of time for the sealant to dry completely.

UniBond Indoor Window & Door Frame Sealant

UniBond Indoor Window & Door Frame Sealant

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If you’re looking for a versatile and reliable window sealant, the UniBond Indoor Window & Door Frame Sealant is a great choice. We’ve had a positive experience using this product for various sealing tasks around our home, and we’re confident that it will meet your needs too.

Pros

• The water-based formula makes it easy to clean up and paint over, allowing for a seamless finish.
• The sealant is flexible and can adhere to most building materials, making it suitable for a wide range of applications.
• It comes with a 5-year guarantee (provided good working practices are followed), giving you peace of mind that you’re making a wise investment.

Cons

• Not suitable for use on exterior or wet areas, uPVC windows, bedding components, or bathrooms.
• The sealant can be difficult to apply uniformly, which may require some extra effort to achieve a neat finish.
• It may take longer than the advertised time for the sealant to dry and cure completely, so be prepared to wait a bit longer before painting or exposing it to water.

In our experience, the UniBond Indoor Window & Door Frame Sealant is a reliable and effective solution for sealing gaps and joints around windows, doors, skirting boards, coving, worktops, and wooden rails. The sealant is easy to apply using a standard cartridge dispenser, and it adheres well to most surfaces without cracking or peeling over time.

One of the main benefits of this sealant is its flexibility, which allows it to expand and contract with changes in temperature and humidity without losing its adhesion. This makes it ideal for use in areas that are prone to movement, such as door frames and window sills.

We also appreciate that the sealant is mould resistant, which helps to prevent the growth of unsightly and potentially harmful mould and mildew. This is especially important in areas with high humidity or moisture levels, such as kitchens and bathrooms.

Overall, we would recommend the UniBond Indoor Window & Door Frame Sealant to anyone looking for a versatile and reliable solution for sealing gaps and joints around their home. Just be sure to follow the manufacturer’s guidelines and allow sufficient time for the sealant to dry and cure before painting or exposing it to water.

CT1 Anthracite (Dark Grey) TRIBRID Multi-Purpose Sealant & Adhesive

CT1 Anthracite (Dark Grey) TRIBRID Multi-Purpose Sealant & Adhesive

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If you’re looking for a versatile sealant and adhesive that can bond a wide range of materials, CT1 Anthracite is definitely worth considering.

Pros

• The TRIBRID Technology makes it stronger than traditional hybrid polymers, providing a reliable solution to sealing and bonding.
• It’s environmentally compliant and resistant to chemicals, vibrations, and wet or dry conditions.
• It can be used both indoors and outdoors, on a variety of surfaces including metals, glass, wood, concrete, and most synthetic materials.

Cons

• The dark grey colour may not be suitable for all applications.
• It’s not recommended for use on certain plastics such as PP, PE, and PTFE.
• It’s slightly more expensive than traditional silicone sealants.

We recently used CT1 Anthracite to seal a shower and were impressed with its performance. It was easy to apply using the included applicator nozzle and provided a strong, waterproof seal. We also appreciated the fact that it’s odourless and doesn’t shrink or crack over time.

One thing to keep in mind is that the dark grey colour may not be ideal for all applications, so you may want to consider a different colour if aesthetics are a concern. Additionally, while CT1 can bond most synthetic materials, it’s not recommended for use on certain plastics such as PP, PE, and PTFE.

Overall, if you’re looking for a versatile, high-performance sealant and adhesive, CT1 Anthracite is definitely worth considering. Its TRIBRID Technology provides a reliable solution to sealing and bonding a wide range of materials, and its resistance to chemicals, vibrations, and wet or dry conditions makes it a great choice for both indoor and outdoor applications.

Buying Guide

When it comes to buying the best window sealant, there are a few important factors to consider. Here are some features to look for:

Material

Window sealants are available in different materials, such as silicone, latex, and polyurethane. Each material has its own advantages and disadvantages, so it’s important to choose the right one for your specific needs. For example, silicone sealants are known for their durability and resistance to extreme temperatures, while latex sealants are easy to clean up and paint over.

Application

Consider the application method of the sealant. Some sealants come in a tube that can be applied with a caulking gun, while others come in a squeeze bottle or can be applied with a brush. Choose the application method that works best for you and your project.

Drying Time

The drying time of a sealant can vary depending on the material and brand. Some sealants can dry in as little as 30 minutes, while others may take several hours or even days to fully dry. Consider the drying time when choosing a sealant for your project.

Colour

If you plan on painting over the sealant, consider the colour of the sealant. Some sealants are available in clear or white, while others come in a range of colours. Choose a colour that will blend in well with your window frame or one that you can easily paint over.

Price

Window sealants are available at different price points, so it’s important to choose one that fits your budget. However, keep in mind that the cheapest option may not always be the best quality and may not last as long as a more expensive option.

By considering these factors, you can choose the best window sealant for your project with confidence.

Keith Jones

Hello, I’m Keith Jones. I’m the author and head of content here of door and window guide. I’ve been in the window and door industry for over 10 years in the UK and North America. I’ve had quite a few roles during my career mainly in Worldwide sales. I’m now semi retired so I thought I’d put my knowledge to good use educating people about all they might need to know about door and window related topics.