There's no need to sand or to use harsh chemical to remove rust or bluing.
Just soak it in Evapo-rust, a unique water based selective chelation agent.
Quote:
On average, one gallon de-rusts up to 300 pounds of light to moderately rusted steel.
EVAPO-RUST is highly recommended by the NRA gunsmithing school and is utilized by FBI, CIA, NATO and other law enforcement and forensics agencies. EVAPO-RUST is perfect for removing oxide weapon finishes such as Bluing, Parkerizing, Zinc Phosphate, and Browning.
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http://www.evaporust.com/evaporust.html
Home page:
http://www.evaporust.com/