A composition and method for protecting the surface of an exposed body of water comprising 10 to 95 wt % silicone polymer； greater than zero to 15 wt % carrier material； and greater than zero to 20 wt % surfactant. The method includes the steps of adding the composition to the surface of the water and allowing the composition to form a liquid film across the surface of the water. The film is effective for reducing evaporation of water from the surface.
