The best Adfast window sealants

One of the best ways to improve your home’s energy efficiency and prevent water infiltration and drafts is to make sure your windows are well sealed. One way to do this is to apply sealant to any areas that may not be airtight.

In order to make the perimeter of the windows 100% airtight, it’s important to choose a sealant designed specifically for that purpose.

In this article, find out which features make for a good window and door sealant and which Adfast products are perfectly suited for the job.

Features of the best window sealants

Before going to the hardware store to buy a sealant cartridge, it’s important to know the characteristics and properties that make a sealant product effective at caulking doors and windows.

The components of sealants vary greatly, making some products much more suitable for this use than others.

Adhere well to various types of building materials

Windows and the walls that hold them can be made with many different materials. A good window sealant must therefore be able to adhere solidly to a variety of bases, such as glass, plastic, aluminum and masonry.

Good resistance to UV rays

Prolonged exposure to UV rays can affect the performance of some silicone sealant products. These rays can cause discoloration, loss of flexibility, and even cracks in joints made with sealants that are susceptible to them.

Remain flexible even at low temperatures

Windows are regularly subjected to hostile weather conditions. In North America, temperatures can drop well below freezing, which can reduce the flexibility of some sealants. For best results in all seasons, it’s important to choose a product that will remain flexible even when subjected to freezing temperatures.


it is recommended that you choose a non-corrosive sealant in order to avoid damaging the metal components of your windows and building. That way, you avoid the risk of the sealant causing rust on your house.

Offered in a variety of colours

Some sealants can’t be painted because paint doesn’t adhere to their surface. It’s best to try to find a sealant with a colour that blends well with the tones of your windows and building.

Adfast Adseal 4550: The sealant of choice for window and door manufacturers

For over 25 years, window and door manufacturers have counted on Adfast sealants to help ensure that their products are durable and energy efficient. The Adseal Production 4550 Series 100% silicone window and door sealant is the perfect choice to meet the specific needs of the industry.

In addition to meeting all the criteria mentioned above, many of its features make it ideal for window assembly:

  • Meets multiple ASTM and AAMA standards
  • Low in VOC
  • Available in cartridge, sausage, pail and drum formats

Adfast Adseal 4580: The best sealant for window caulking

In the construction industry, Adfast is synonymous with high-quality sealants, especially when it comes to window caulking. Many contractors rely on Adseal DWS 4580 Series silicone sealant to seal the edges of windows and doors after installing them.

Not only does it have all of the properties sought after in a window sealant, it has many other characteristics that make it ideal for outdoor caulking:

  • Available in over 300 colours, including 13 metallic colours (you can even use a tool to find the sealant colour you need)
  • Can be used indoors
  • Low in VOC
  • Available in multiple formats

Make sure to choose the best Adfast Adseal sealant for each of your projects

In conclusion, the best window sealants must adhere properly and remain effective despite the hostile conditions they encounter.

While the Adseal Production 4550 Series and the Adseal DWS 4580 Series are both excellent window sealants, we invite you to take a look at other Adfast products, use our product selector or contact our specialists for advice on which product will give you the desired results.