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PS890 is designed to seal fuel tanks in aircraft. With a temperature range between -55 degrees C and 135 degrees C, PS890 is extremely durable. The manganese-cured polysulfide compound has two parts that, when mixed together and applied, cure at room temperature. PS890 stands up to corrosion and fungus, as well as extended contact with jet fuel. Typically applied by brush or gun, PS890 has a shelf life of more than nine months.