How weather affects sealant performance and what you can do about it

Weather conditions play a significant role in the performance and longevity of sealants used on driveways and patios. Understanding how various weather factors impact sealant effectiveness and knowing how to address these challenges can help you achieve the best results and protect your surfaces effectively. Here’s how weather affects sealant performance and what you can do to ensure optimal results in different climates.

1. Temperature Extremes

High Temperatures:
In hot weather, sealants can dry too quickly, which may result in an uneven application and reduced bonding. Excessive heat can also cause some sealants to become too soft or sticky, leading to a compromised protective layer.

Low Temperatures:
Cold temperatures can hinder the curing process of sealants, leading to incomplete drying and reduced effectiveness. Sealants applied in cold conditions may not adhere properly and can become brittle or prone to cracking.

What You Can Do:

Follow Manufacturer Guidelines: Always check the recommended temperature range for application provided by the sealant manufacturer.
Avoid Extreme Weather: Try to apply sealant during mild weather conditions. For high temperatures, choose early morning or late afternoon to avoid peak heat. In cold weather, ensure temperatures are within the acceptable range and consider using sealants formulated for lower temperatures.

2. Humidity and Rain

High Humidity:
Excessive humidity can slow down the drying process and affect the sealant’s ability to cure properly. High moisture levels can also cause the sealant to trap moisture underneath, leading to peeling or blistering.

Rain:
Applying sealant just before or during rain can wash away the product or prevent it from adhering correctly. Rain can also cause the sealant to cure unevenly, compromising its effectiveness.

What You Can Do:

Check Weather Forecasts: Ensure there is no rain forecasted for at least 24 hours after application. Apply sealant on dry days and avoid days with high humidity.
Use Weather-Resistant Sealants: Opt for sealants designed to perform well in various weather conditions, including high humidity or occasional rain.

3. Sun Exposure

Direct Sunlight:
Direct exposure to the sun can cause sealants to dry too quickly, leading to an uneven finish and potential application issues. UV rays can also degrade some sealants over time, reducing their effectiveness and lifespan.

What You Can Do:

Apply During Cooler Parts of the Day: To avoid rapid drying, apply sealant in the early morning or late afternoon when temperatures are cooler.

Consider UV-Resistant Sealants: Choose sealants with UV stabilisers or additives that enhance resistance to sunlight and prevent degradation.

4. Wind

Strong Winds:
Wind can cause debris and dust to blow onto the wet sealant, leading to imperfections and a rough finish. It can also cause the sealant to dry unevenly if it blows directly onto the surface.

What You Can Do:

Protect the Area: Use temporary barriers or coverings to shield the surface from wind and airborne debris during application.
Choose Wind-Resistant Sealants: Some sealants are designed to resist environmental factors like wind and dust better than others.

5. Seasonal Considerations

Seasonal Changes:
Different seasons bring varied weather conditions that can affect sealant performance. For example, the transition from wet to dry seasons may require adjustments in sealing schedules and techniques.

What You Can Do:

Plan Sealing Timely: Schedule sealant application before major seasonal changes, such as before the onset of heavy rain or extreme heat.
Monitor Surface Conditions: Regularly check the condition of your surfaces and reseal as needed based on seasonal wear and environmental conditions.

Conclusion
Weather conditions can significantly impact the effectiveness of sealants, affecting their application, curing, and overall performance. By understanding how temperature, humidity, rain, sun exposure, wind, and seasonal changes influence sealant performance, you can take appropriate measures to ensure optimal results. Following manufacturer guidelines, choosing the right products, and applying sealants under favourable conditions will help you maintain the durability and appearance of your driveways and patios for years to come.