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A trusted, reliable sealant for aluminum allows and corrosion barriers between dissimilar metals is PR1772B2. PR1772B2 us a manganese dioxide cured polysulfide compound with two parts. Uncured, the material is thixotropic paste with low slag, and is most efficiently applied with an extrusion gun or spatula. It has moderate heat resistance, up to 120 degrees Celsius, and cures at room temperature. The resulting seal is removable and best used on standard aircraft substrates.