Starbrite Snap & Zipper Lubricant keeps snaps and zippers working properly on boat enclosures, vinyl cushions, boat covers and more. Each application lubricates and protects these metal and plastic parts against corrosion, excessive wear and salt spray. Won't wash off. Features Apply to boat snaps, metal and plastic zippers to protect against corrosion, reduce wear and friction, prevent binding and repel salt spray deposits Non-toxic, non-staining Will not wash off