Rain-X Water Repellent forms a transparent and water-repellent protective layer on the glass. on which water does not remain. Improves visibility day and night. Repels rain. sleet and snow and helps prevent frost. In addition, it prevents insects and other road pollution from sticking to the windshield. For best results, treat the surface once a month. Suitable for use on windows and glass doors. For laminated/tinted glass, test the products suitability in a small hidden area. Avoid contact with painted surfaces and plastic. Tests conducted at a university in the United States showed that using Rain Repellent significantly improved visibility and thus extended the time to react by up to a full second. At highway speeds, this is an additional braking distance of almost four car lengths!