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A reliable sealant for aircraft windshields and canopies is PR1829B2. The substance is a two part, epoxy cured Permapol polythioether compound in the form of a paste, and is best applied with an extrusion gun. Specifically, the sealant is trusted for use with fillet sealing of polycarbonate, acrylic, glass, and other aerospace applications. PR1829B2 is resistant to ultraviolet rays, humidity changes, and weather exposure. Unlike similar products, PR1829B2 can cure at low temperatures.