How Cool Paint (Heat Reflective Paint) Works: Benefits and Application - HOMESLIBRO - Blogs on Home Related Solutions


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How Cool Paint (Heat Reflective Paint) Works: Benefits and Application

Understanding Cool Paint (Heat Reflective Paint)

Cool paint, also known as heat reflective paint, is specifically designed to reflect more sunlight and absorb less heat compared to standard roofing materials. This unique property helps reduce roof temperature and, consequently, the room temperature below. In air-conditioned spaces, this reduction in temperature gradient across the slab can lead to significant energy savings by lowering power consumption.

How Cool Paint Works

Similar to how light-colored clothing can keep you cooler on a sunny day, cool paint is formulated to reflect a greater portion of sunlight. It is made from highly reflective materials and is typically an aqueous coating based on acrylic resins. This eco-friendly paint, when applied to cement, asbestos, or MS (mild steel) roofing, increases the surface’s emissivity, reflecting more heat energy away.

Key Features of Cool Paint

  • High Reflectivity: Designed to reflect UV and IR rays back into the atmosphere, reducing the heat absorbed by the roof.
  • Insulative Properties: Non-conductive properties and uniform application provide effective insulation.
  • Emissivity: The paint increases the emissivity of the surface, enhancing heat reflection.

Application Process

Applying cool paint is straightforward and can be done using a brush, roller, or spray. Here’s a step-by-step guide:

  1. Surface Preparation: Clean the surface thoroughly with water and, if necessary, use bleaching powder.
  2. Mixing: Stir the paint thoroughly before each use to ensure uniformity.
  3. First Coat: Apply the first coat with a brush on the cleaned and washed surface.
  4. Drying Time: Allow a gap of 3 to 4 hours before applying the second coat.
  5. Second Coat: Apply the second coat ensuring it does not come into contact with water for at least 2 hours.
  6. Curing: After full coating, allow the paint to cure properly.

Benefits of Cool Paint

Cool paint offers several advantages:

  • UV and Infrared Resistance: Continuous rejection of solar heat leads to a significant reduction in roof temperature.
  • Thermal Comfort: Keeps the coated area comfortable even during peak summer afternoons.
  • Eliminates False Ceilings: Reduces the need for additional insulation materials like false ceilings.
  • Versatility: Can be applied to any roofing material or side walls.
  • Environmental Impact: Helps in reducing greenhouse gas emissions and global warming.
  • Algae and Mold Resistance: Some cool paints include chemicals that prevent algae or mold growth in warm, moist conditions.
  • Non-Toxic: Contains no solvents, cleans up with water, and includes no toxic substances.

Selecting Good Cool Paint

When choosing cool paint, consider the following:

  • Solar Reflectance Index (SRI): A good cool paint should have an SRI value between 121-123. SRI incorporates both solar reflectance and thermal emissivity, indicating the roof’s ability to reject solar heat.
  • VOC Levels: The volatile organic compounds (VOC) in cool paint should be between 1.2-1.34 grams per liter.
  • Safety and Durability: The paint should be free of solvents and toxic substances, waterproof, dustproof, and resistant to fungal growth during monsoon.

Practical Tips for Maximizing Benefits

  • Regular Maintenance: To ensure the longevity and effectiveness of cool paint, perform regular maintenance checks for any signs of wear or damage, especially after extreme weather conditions.
  • Combined Approaches: While cool paint is effective, combining it with other energy-saving measures like proper insulation, energy-efficient windows, and ventilation can further enhance overall energy efficiency.
  • Consider Climate: The effectiveness of cool paint can vary depending on the local climate. In regions with high sunlight exposure and hot temperatures, the benefits will be more pronounced.
  • Professional Application: For optimal results, consider hiring professionals for the application process, especially for large or complex roofing areas.

Environmental and Economic Impact

Using cool paint not only improves indoor comfort but also contributes to broader environmental and economic benefits:

  • Energy Savings: By reducing the need for air conditioning, cool paint can significantly lower energy bills, leading to long-term cost savings.
  • Reduction in Urban Heat Island Effect: In urban areas, widespread use of cool paint can help mitigate the urban heat island effect, where city areas become significantly warmer than their rural surroundings.
  • Sustainability: By decreasing the demand for energy and reducing greenhouse gas emissions, cool paint supports sustainable building practices and contributes to global efforts against climate change.


Cool paint is an innovative solution for managing roof temperatures and enhancing energy efficiency. Its ease of application and eco-friendly properties make it a practical choice for both residential and commercial buildings, providing long-term benefits in terms of comfort, cost savings, and environmental impact.


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