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PPG Aerospace/PRC DeSoto® Adhesion Sealant Semkit 654 Dk Red Mil-S-8784 Rev B Cl B-1/2 6oz PR1428B1-2
This sealant can also be used to protect electrical wires, terminals and equipment against fuel, moisture, dirt and short circuits.
It is a manganese dioxide cured polysulfide compound, and the uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It has a service temperature range of -54°C (-65°F) to 121°C (250°F), with intermittent excursions up to 135°C (275°F). It cures at room temperature to form a removable seal to common aircraft substrates.