Help prevent damaging flood waters from entering your homes or business. Use on smooth, even, flat surfaces. Instantly bonds to horizontal and vertical surfaces. Use on all types of openings: windows, doors, seams, garages, casings, thresholds, conduits, vents and ducts, key holes and more. No water penetration through 1/2-inch gaps at depths up to 2 feet for 14 days. Easily removable once waters recede.