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PS890C48 is a sealant specifically designed for aircraft fuel tanks and fuselage components. Composed of two parts of a manganese dioxide-cured polysulfide compound, PS890C48 can be applied by brush, spatula or gun. Although cured at room temperature, PS890C48 can withstand temperatures ranging between -65 degrees Fahrenheit and 250 degrees Fahrenheit, sometimes even up to 275 degrees Fahrenheit. PS890C48 has proven reliable despite constant exposure to jet fuel and air gases.