How are these white streets created? The white coating known as CoolSeal is sprayed thickly onto the roadway and then manually spread and smoothed out over the entire surface. This allows it to dry and harden quickly. In addition to making the streets and surrounding area significantly cooler, this process also saves energy. Buildings in the area do not need to use as much air conditioning, plus the higher reflectivity of white streets means less electricity is needed to illuminate streets and parking lots when the sun starts to set.