Dap 18366 DAP Gutter and Flash 3.0 Sealant 9-Ounce An advanced sealant specially formulated with Kwik Dry technology Allows exposure to water and moisture after only three hours without washing out Ideal for sealing gutters, drain spouts, lapjoints, roof vents, flashing, aluminum sliding and other metal surfaces Mold and mildew resistant Permanently watertight and weather tight