Metal Rescue GEL is a rust remover designed for iron and steel. It is safe on metals other than iron and steel as long as they are not left in contact with GEL for too long. GEL will remove some oxides from copper, brass, and nickel but contact time is critical. The length of contact time is dependent upon the amount of oxidation present and alloy composition. It is recommended that the following metals be checked approximately every 30 minutes so as not to damage the surface under the oxidation layer: brass, copper, chrome, gold, lead, nickel, silver, titanium, tungsten, solder or solder points.
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