What is the Metal Rescue Use Life and Shelf Life?

One gallon of Metal Rescuewill remove approximately a 1⁄2 pound of dry rust. That is equivalent to removing rust from approximately 300 pounds of moderately rusted steel. For reference, 1 gallon of Metal Rescue will remove rust from approximately 10 square feet of moderately rusted steel. If any of the Metal Rescue solution evaporates, simply replace it with fresh tap water to original level. Metal RescueTM has an indefinite shelf life for unopened product stored in proper conditions – room temperature/ indoor/out of direct sunlight. Once opened, a shelf life of 12 months can be expected but will vary dependent on evaporation and contaminates introduced.