Tests performed with electron spectroscopy for chemical analysis (ESCA) show that 2-4 hours after a steel panel is removed from a ZERUST® VCI package, all traces of the corrosion inhibiting molecular layer are gone from the surface of the part.
The period of time before one can expect corrosion to occur on a part depends on the cleanliness of the part and the environment around the part (relative humidity, presence of pollutants or wood, temperature, etc.)