Fight the high cost of rust with the same vapor phase corrosion inhibitors (VpCl) developed for the military and NATO. The metal seeking vapors in Windlass Rustblocker form an invisible layer of electrochemical inhibitors that seal metal against the air and moisture. Easy spray-on application removes dirt & grime and seals bare metal for long lasting protection. Perfect for all metal products including knives, swords, axes, firearms or any metal part requiring cleaning and corrosion protection! No express or air shipping with this item.