When it comes to sealcoating asphalt driveways or commercial parking lots, the ideal temperature range is between 10°C and 32°C (50°F and 90°F). The best temperatures are dry, sunny days that begin at 21°C (70°F) and continue to rise throughout the afternoon. Applying sealant above 32°C (90°F) is generally not recommended due to potential issues like flash drying, poor adhesion, and premature failure.
Why Sealcoating in Extreme Heat is Not Recommended
Flash Drying: When temperatures exceed 90 degrees, the sealant can dry too quickly upon contact with the hot pavement. This rapid drying prevents the sealant from adhering properly, leading to a weak protective layer.
Surface Penetration: High heat can cause the asphalt to become too hot, preventing the sealant from penetrating the surface effectively. Instead, the sealant dries on top, resulting in a weak bond that can easily be stripped away by traffic.
Tracking & Premature Failure: Sealcoating in excessive heat can lead to premature failure. The sealant might appear dry on the surface while remaining uncured underneath, causing it to wear off quickly and fail to protect the asphalt.
Long-Term Effects: Poorly applied sealant due to extreme heat can accelerate asphalt deterioration. This can lead to more frequent repairs and increased costs over time.
Techniques for Sealcoating in Hot Weather
As a professional asphalt sealing company, we employ specialized techniques to ensure successful application even in hot weather:
Cooling the Pavement: We may cool the pavement by spraying a light mist of water before applying the sealant. This helps lower the surface temperature and allows for proper adhesion.
Adjusting Application Rates: Applying thinner coats of sealant helps prevent flash drying. The first coat acts as a primer, ensuring better adhesion for subsequent layers.
Timing the Application: Scheduling seal coating projects for early morning or late afternoon can help avoid the peak heat of the day, reducing the risk of flash drying.
While the ideal temperature range for seal coating is between 10°C and 32°C (50°F and 90°F), at Asphalt Sealing, we use advanced techniques to manage seal coating projects in hot weather, ensuring your asphalt gets the best protection. Contact us today for a free quote and expert advice on your driveway or commercial seal coating needs.