Super high viscosity Castle® Pure Silicone Spray™ contains 99.1% pure silicone. This is a universal spray lubricant is excellent for solving problems of sticking, binding, squeaking, and lubrication. Pure Silicone™ extends the life of rubber weather stripping on doors, windows, hoods, and trunk lids. When applied prior to freezing winter temperatures, it will help prevent freeze-up. It protects metal from rust and corrosion, and effectively dries moisture from wet parts such as switches, relays, distributors, plugs, and chain drives. Pure Silicone™ also waterproofs boots and shoes, and will not stain. It contains no grease fillers, and is an excellent release agent for heat seal equipment.