Steelgard® 40-M-1 Base is an indoor rust preventive base for all ferrous surfaces including bearing steels, and tool steels. It is a barium free product. It can be used neat for maximum protection, but is generally used cut with from one to nine parts diluting oil or solvents. It is available in ready-to-use dilutions with mineral spirits, kerosene, 100 viscosity group I oil, mineral seal oil and similar vehicles.