BG HCF Waterproof Spray Lubricant stands for Heat Corrosion Friction. As such, it is an all-purpose spray lubricant. Unbelievably tough and stays where you need lubrication in temperatures as high as 550°F (288°C). Under water, it stays where it’s supposed to, even when exposed to harsh chemicals and in salt-water environments. Superior under heavy loads. Highly effective rust protector. Excellent chain lubricant.