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LaVanture TNG series 1/8" thick by 3/4" wide preformed butyl tape. The TNG series is a 100% cross-linked butyl, performed sealant used for lap sealing. It adheres to a wide variety of substrates including steel, aluminum, and porcelain. It seals dissimilar metals, preventing contact that can potentially cause electrolysis (galvanic corrosion). The tape is extruded onto silicone coated paper for easy application.