Silicon grease is a water proof grease used in the plumbing trades on "O" rings. If you have a rotating seal that uses grease, it's the weapon of choice. Faucet stems on kitchen sink are one use. Rotating coupling on hose reels are another. If you own a pump up sprayer, or a water filter, silicon grease applied to the "O" ring is a life saver. Recently, I had two ocassions where I thought I was going to replace the "O" ring in both a pump up sprayer, and a water filter. Some silicon grease and I was good to go, with no leaks.