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Integral fuel tank sealant that is of quality constitution is hard to come by. Using PR2001B2 solves that problem. This two-part compound PR2001B2 has low sag and can be easily applied. It cures quickly, and PR2001B2 has a high heat tolerance. Even after it is exposed to gasoline and fuel, PR2001B2 stands up well. That is why PR2001B2 can be used on all aircraft substrates, not just on integral fuel tanks.