Metal Guard 320 is an economical and versatile rust-preventative soluble oil, which when mixed with warm water and heated to 140°F to150°F leaves a corrosion-resistant, semi- dry film. Metal Guard 320 is an excellent rust preventive recommended for “dry-to-touch” finish requirements on phosphate surfaces specified for military and automotive applications. A 10% percent solution of Metal Guard 320 will provide 250 to 300 hours of ASTM B-117 salt spray protection over a heavy zinc phosphate coating. Metal Guard 320 is also recommended for use on black oxide and bare steel surfaces. Metal Guard 320 is typically applied to metal surfaces by immersion, however it can be brushed or sprayed as well. Metal Guard 320 can be mixed with water, preheated to 120°F to130°F, in the proportions of 5% to 25% by volume, depending upon the final film thickness and dryness desired.
