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Hubbard-Hall’s Metal Guard 450 is a water-displacing solvent rust preventative for aluminium, steel, stainless steel or copper alloy substrates. This low odour, transparent amber solution, is non-viscous, and can be applied by spray, immersion, brushing or flood coating. Metal Guard 450 is used as delivered, and has been formulated to leave a dry-to-touch finish on coated substrates. It is recommended as a final dip on black oxide and phosphate finishes, however, it also offers effective protection against rust and corrosion on automobile parts and accessories, sewing machines, firearms, all types of fasteners, small gasoline engines, machine tools, dies, jigs, fixtures and metal stampings. This product meets MIL Spec MIL-C-16173D Grade 3 and MIL-C-22235A.