Metal Guard 800-D is clear, non-flammable, mildly alkaline, liquid rust preventative which is used in metal finishing processes for protecting ferrous metals against rust during an “in-process” operation. Furthermore, the versatility of Metal Guard 800-D allows it to be used in immersion operations, power wash machines and vibratory tumbling flow-through systems. Solutions of Metal Guard 800-D will not cause rusting when the work (steel or cast iron) remains immersed. Metal Guard 800-D does not contain inorganic salts; therefore, no powder residues are left on the surface of the metal after application.