Exterior paint is directly affected by temperature, humidity, rain and wind.
Very hot surfaces can make paint dry too quickly, while cold or humid conditions can slow drying. Do not paint a wet surface or when rain is expected too soon.
Application limits vary by product, so follow the technical data for the specific coating.
Read the forecast properly
Consider more than daytime air temperature. Surface temperature, overnight humidity, rain and dew also matter. Check application and rain-protection requirements. A sunlit wall can be substantially hotter than the air, while a shaded wall may dry more slowly.
Plan the workday
Divide the facade into sections and work in suitable shade. Postpone when rain, strong wind or dew threaten the drying window. Good midday weather may still lead to evening moisture before the film is ready. Do not rely on one universal temperature limit; use the instructions for the specific primer and coating.
Exterior checklist
- Evaluate weather and surface conditions together.
- Repair leaks, cracks and loose coating before painting.
- Check separate application and protection requirements for primer and finish.
Can I risk a low chance of rain?
Do not decide from the percentage alone. Assess conditions throughout the product's rain-protection window. Wind-driven rain can reach shaded surfaces, so consider both the work plan and available protection.