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Existing marine greases are formulated to treat mechanical devices, not electrical connections. They do not address a common issue that affects metals, oxidation/corrosion. DeoxIT L27 Electrical Marine Greases not only lubricate and protect connections, they improve the conductivity of the connection (without shorting). They are infused with DeoxIT Dx100L fluid. It has the ability to lift off oxidation and corrosion without harming metal surfaces. L27 is gentle and works slowly to lift off contaminants. It keeps working until most if not all of the oxidation is lifted. The mechanical action of the device then displaces the contaminants away from the connection. When you first apply the DeoxIT L27 Grease, the DeoxIT fluid molecularly bonds to the metal, sealing and lubricating the metal surfaces, so even when the grease eventually separates from the surfaces, the DeoxIT Dx100L fluid is still protecting the surfaces. DeoxIT Greases keep working when other greases stop!