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PS870B1/2 is a filleting fuel tank sealant often used in aircraft repairs. This is because PS870B1/2 is made with anti-corrosive properties, which makes it perfect for maintaining the aluminum alloys out of which many aircraft are made. Also beneficial is PS870B12's ability to withstand extreme hot and cold conditions and it is not affected by exposure to jet fuels and gas. Even better is that PS870B12 cures at room temperature.