Household paraffin wax has many uses besides canning and candle-making. It’s cheap, comes in handy bar sizes and works well to lubricate and waterproof zippers on boat cushions or weather curtains. Waxing the carpeted bunks on boat trailers makes launching and recovery easier, too. To apply, launch the boat, park the trailer in a sunny spot and go fishing. When you come back, before re-loading, use a bar to liberally rub the carpeted horizontal and side guide bunks. Carpet warmed by the sun makes spreading easier. It may take a couple applications to thoroughly embed the wax into the carpet, but once applied it lasts for months. A word of caution, though: Make sure the boat is over the water before unhooking the tow strap or safety chain or the hull may have an unwelcome encounter with concrete.