Slydz-On Spray-On Bunk Lubricant makes launching your boat much easier. This bunk lubricant dramatically reduces the stress on the trailer crank mechanisms, ropes, and hull bow hooks. Slydz-On allows you to load and unload your boat in shallower water. This spray-on lubricant is also great for work stations, boat lifts, and watercraft dollies. Fast and simple application. Shipped ground only.