How can a roof coating be made reflective?

A roof coating can be made reflective primarily through the addition of an aluminum paste. This material serves as a reflective agent, enhancing the coating's ability to reflect sunlight away from the building. Aluminum paste contains tiny particles that create a highly reflective surface, which can significantly reduce heat absorption. This not only helps in maintaining the roof's temperature but also contributes to energy efficiency by decreasing cooling costs.

While using a glossy sealer and increasing the thickness of the coating may provide some level of reflectivity, they do not achieve the same effectiveness as aluminum paste. A dark pigment would absorb more heat rather than reflecting it, which would not help in achieving a reflective surface. Therefore, the most effective method for making a roof coating reflective is indeed through the incorporation of aluminum paste.