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PS890A1/2 is a fuel tank sealant that has anti-corrosive properties. This means that PS890A1/2 does not allow anything to happen under its seal once it is applied to aluminum alloys and dissimilar metals. Even after it is exposed to jet fuel and gas after a long period of time, PS890A12 remains unchanged and just as durable. This means that PS890A12 is perfect to apply to the surfaces all over an aircraft.