This amazing glass sealer is permanently elastic & will not crack or wither under UV rays; it is resistant to water, caustic washing solutions & atmospheric influences. Use between rubber profiles & body joints when fitting front & rear windscreens. The Black Windscreen Sealer is also perfect for fitting sunroofs. Will not attack chrome, paint or rubber. Tack Free Time at 20º C/65 % RH: 24 hours Arbomast Autograde forms a skin after Approx. 14 days depending upon atmospheric conditions. A Caulking Gun is required to apply.