Because silicones can withstand astonishing stress and temperature extremes, they are used in many aspects of aircraft and spacecraft assembly and maintenance. Silicones in paint and coatings reduce drag, which in turn reduces friction and increases fuel efficiency. Silicones can also help protect spacecraft from UV radiation and extremes of cold in space and heat during launch and as it returns to earth through the atmosphere Adhesives and sealants are used to seal and protect the following from the elements: doors, windows, wings, fuel tanks, hydraulic switches, overhead bins, wing edges, leading gear electrical devices, vent ducts, engine gaskets, electrical wires and black boxes.