Water displacement means that oil pushes away little water which is adhered to metal workpiece. Most of our rust preventive oil has water displacement performance including CP-4000.

There is a possibility of what working liquid or detergent is water-soluble.
Rust prevention process is necessary after the processing or washing the metal workpiece when using water-soluble solvent.
If water stays on the metal workpiece, the part will start rusting.

Hence, rust preventive oil should cut in between metal workpiece and moisture like the figure in the above.
When using rust preventive oil with a tank, it should be changed regularly because moisture in the tank increases and rust preventive oil is polluted.
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