Roof leaks always seem to occur at the worst time. But with SWEPCO Leak Stopper, you can be prepared to stop them before major damage or inconvenience occurs. Even in the pouring down rain. Simply pour these specially processed mineral granules on the site of the leak and in just minutes, the leak is temporarily patched. Anyone can do it. The granules automatically follow the water to the site of the leak and, once found, begin expanding to plug the leak until permanent repairs can be undertaken by maintenance personnel. Nothing is more effective as an emergency leak repair material. And it's a lot cheaper than a service call by a roofing contractor. Keep it on hand for that "rainy day".