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The PS870B1/2 is a filleting fuel tank sealant. This quality sealant serves as a protection barrier against aluminum alloy corrosion. It can also bond and protect other metal properties as well. As a two-part Polysulfide compound, the PS870B12 can be applied by a spatula or industrial spreader. Instructions are available for first-time or seasoned users as well. The product cures at room temperature, and is widely used to bond aircraft parts and components.