Rust Free reduces hazards in the workplace by eliminating the extremely flammable characteristics of most penetrating sprays. It frees rusted and corroded nuts, bolts, studs, set screws, aluminum and copper fittings. Rust Free penetrates through grease, soil, and sludge. It lubricates and prevents corrosion on rusted and frozen parts. It is used in garages, factories, on farm machinery, marine and aeronautical equipment, in shops and homes.