We’re working on an international project and having a hard time finding a coating with a published value for Solar Reflectance Index. If the coating is white, can we assume that it qualifies?

It is not possible to assume that a light-colored roof or coating has a compliant or high SRI value. The SRI for different products vary even if they have a similar looking color. The SRI value of any coating has to been verified through manufacturer data or independent testing.