Flex Paste Flood is specially formulated to help defend homes and businesses for floodwaters, all while being completely removable after water recedes. Should be used as a base coat for your first layer of protection and in combination with our other Flood Protection products. Use on all types of openings such as windows, doors, seams, garages, casings, thresholds, conduits, vents and ducts, key holes and more. Flex Paste Flood Protection UL Verified: No water penetration through 1/2 In. gaps at depths up to 3 Ft. for 14 days.