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Hubbard-Hall’s Metal Guard 350 is a thin film emulsion rust preventative, designed to give effective corrosion protection and lubricity to blackened, phosphated, and bare metal surfaces. With typical applications being at final coat: after black oxide, zinc or manganese phosphate, or on bare steel. Metal Guard 350 solution is an opaque tan, low odour, water emulsion, which can also be diluted for special applications. It leaves an extremely thin waxy film, which will air dry in a short time. For faster drying, warm air or heated spin dryer methods are recommended. If at any time parts require reprocessing, the coating is easily removed with alkaline cleaner, or a vapour degreaser.