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This two-part polysulfide known as PR1776MB2 is used primarily to seal fuel tanks and other fuselage in aircraft. PR1776MB2 is a low weight version of similar products, but works just as well. Easy to use and cure at room temperature, PR1776MB2 stays resilient and elastic under extreme heat and when exposed to jet fuel and gasoline. Although it only has a 30-minute application time before it sets, PR1776MB2 can be used on any aircraft surface.