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A filleting fuel tank sealer should always have anti-corrosive qualities, and that is true of PS870B2 sealer. As a two-part compound, PS870B2 offers low sag but big resistance to heat, cold, jet fuels and gas. No wonder everyone uses PS870B2 on all surfaces of aircraft. PS870B2 provides a trusted, durable seal that nothing can take off. Moreover, PS870B2's anti-corrosive tendencies means it wards off any corrosion between aluminum alloys and other metals.