This Product is Boeshields T-9 Rust and Corrosion spray on waterproof protection to be used on essentially everything you desire. Not even kidding, uses range from Marine Engines, Bicycle Chains, Gun surfaces, Wings of Airplanes, most importantly for our purposes, Trailer Parts! This is a must have corrosion protection spray for your truck and toolbox. Spray this on all surfaces that you desire to protect from rust. Use on the threads of bolts, Winch Gears, Lug Studs, Latches, anywhere! This spray was made for the Boeing Company for use on Airplanes, meaning its serious stuff. This product dries to a thin waxy film which will consistently protect your that surface for several months. Simply re-apply when doing simply maintenance to your trailer, or when you walk by wishing you could take it out. Keep it in your truck to be used on work equipment as well!