Demand Products Blue Tac is our very best window tape. Our adhesive qualities are less aggressive but hold like glue to windows. It comes off just as easy as it goes on and leaves no residue. Specifically designed for the outdoor protection of glass and other nonporous surfaces for periods of less than 90 days. Blue Window/Glass Protective Film is two mil Thick. A strong film coated with a weather resistant clear acrylic adhesive.We recommend all tape be removed as soon as possible or within 60 days.