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Hundreds of moving parts on a sailboat require lubrication, and choosing the wrong grease — or mixing incompatible types — causes premature failure.0:29 Three greases cover most aboard needs. Dielectric grease, a non-conductive waterproof compound, protects electrical connections including battery terminals, spark plug boots on outboard or generator engines, and battery disconnect switches.1:34 Anti-seize lubricant prevents stainless-to-aluminum galvanic seizure at masthead wind instrument bolts and windlass gypsy fittings; it should not be used on fasteners meant to stay permanently tight, such as motor mount bolts.3:24 Multi-purpose marine grease handles windlass gears, steering cables, sheaves, winches, furler components, thrust bearings, and stuffing boxes.4:04 Calcium sulfonate grease is the recommended choice for marine multi-purpose use: its corrosion resistance, water resistance, and high drop-off temperature match the demands of saltwater environments, and it is widely marketed as marine grease.4:52 Lithium grease drops off faster and suits low-demand applications like sail tracks.5:54 Sodium-based greases resist water poorly and have no practical marine use.4:36 When servicing bearings such as winches or windlasses, remove all old grease and clean the surfaces before repacking — dirt, metal shavings, and water suspended in degraded grease accelerate wear.6:42

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