Gasket is to be pressed on around its entire perimeter to ensure complete adhesion and seal Application surface that comes in contact with the gasket adhesive should be cleaned with a 50/50isopropyl alcohol and water mixture before installation to remove any dirt or oils Clear polycarbonate design is resistant to damage from impact Snap-in design and peel-and-stick adhesive gasket provide an easy to install lens that keeps water out Suggested ambient temperature during installation is60F to 110F Provides trailer access to external sunlight to assisting lighting up trailer interior, without the need for additional power or wiring