Sealants are basic construction materials used to cover gaps and holes to make something airtight and watertight. They come in two varieties: polyurethane and silicone. Silicone is an inorganic substance, while polyurethane is organic. The two, no matter how similar their functions are, have chemically dissimilar compositions. What they are made up of, respectively, determines how they perform and last.

While polyurethane is a strong glue, it is also an organic material that degrades when exposed to UV light. Silicone, on the other hand, does not. So as not to get confused, let’s take a deeper look and learn how to distinguish silicone caulk from polyurethane. Read on to find out more about these two adhesives and how to choose the best one for your next project.

Defining Polyurethane (PU) Caulk

Polyurethane is a moisture and corrosion-resistant organic substance formed when glycol and isocyanate combine. As a result, polyurethane is a strong adhesive, sealer and caulk. Polyurethane caulk can be applied with caulking guns. It comes in tubes that can be used with a standard caulking gun.

Polyurethane caulk is well-known for its moisture, chemical and corrosion resistance, as well as its flexibility. Polyurethane caulk is flexible enough to minimise cracking or loosening. Components must be fully combined before applying industrial-grade polyurethane caulk. It’s also available in a ready-to-use form that doesn’t require mixing.

Defining Silicone Caulk 

Silicone, unlike polyurethane, is an inorganic substance that will not decompose when exposed to UV radiation or intense heat. A silicone-sealed joint can last up to twenty years, whereas a polyurethane-sealed joint only lasts five to ten. Additionally, silicone caulk is flexible and adheres nicely to flat surfaces. Water-resistant silicone caulk and antifungal silicone caulk are perfect for bathrooms, kitchens, laundry rooms and other high-moisture areas. 

The Best Fit for You

While silicone caulk outperforms polyurethane caulk, it does have some drawbacks. Silicone caulk, on the other hand, is unsuitable for paintable surfaces, such as drywall and wood, necessitating the use of polyurethane caulk or a comparable sealer. Check out this general guide that could help you choose the best caulk for your project:

Caulking with PU

Polyurethane caulk should be used to seal wood or other painted surfaces. It adheres nicely to most surfaces but does not work as well as silicone caulk in direct sunlight. Manufacturer warranties are normally five years, however, they can be extended to ten years under certain conditions, such as limited sunlight exposure and joint movement. It takes around 24 hours to dry and is less messy than silicone caulk. It’s difficult to get rid of once it’s dried.

Applications for Silicone Caulk

Silicone caulk can outperform polyurethane caulk on occasion. Except for wood, it adheres well to most surfaces. Furthermore, silicone caulk cannot be painted, so use it with caution. Caulk contains silicone, which inhibits paint adhesion. Because of its tolerance to sunlight and severe temperatures, it is perfect for damp or outdoor surfaces. The bulk of manufacturer’s warranties are for a period of twenty years. It is twice as expensive as polyurethane caulk, but it lasts twice as long.

Sealing Solutions for Plumbing Issues

Silicone caulk is excellent for sealing around plumbing fixtures like bathtubs, showers, toilets and sinks. It is also useful for weatherproofing. Use it to seal around doors, windows and outside utility lines to reduce drafts. Mice and vermin are kept out by plugging the gaps.

Silicone Sealants for Colder Climates

In chilly conditions, it is more difficult to apply the caulk. Furthermore, at low temperatures, it will not attach permanently. Silicone caulk, on the other hand, may be shaped. You must replace all of the polyurethane caulk with silicone caulk after it has been removed. 

Post-Utilisation of Caulk

When silicone caulk is applied, it dries slowly and emits unpleasant or potentially toxic odours. As a result, make sure the room is properly ventilated. It must also be kept dry for several days after application. For large caulking tasks, consider hiring an expert in caulking and sealing services.

Conclusion

The more you know, the better. This notion applies greatly to our knowledge of repairs and minor to major home construction projects. And now that you have a better understanding of sealants and their applications, you will have an easier time accomplishing your next project!

Are you looking for caulking companies in Brisbane? Quality Seal Australia is a team dedicated to giving you the best sealant for your needs. We offer high-quality silicone and caulking services in the area and have become the leading choice for builders and homeowners in the area. Contact us today!