The Wet Storage Stain pub has been updated to reflect the most recent updates and is now available to download for free or to order for $1.57.  Instructive about the minimization and treatment of wet storage stain, this publication prescribes surface treatments and remedial actions.  The publication is also available in Spanish and French (coming soon!) as a free download. 

Wet storage stain is a white or gray powdery deposit that can develop on newly galvanized articles. It may be found on nested or stacked galvanzed products where moisture gets trapped between the articles, restricting adequate airflow to the zinc surfaces, or when galvanized steel is exposed to rain, dew, or high humidity conditions. Wet storage stain is the visible formation of zinc oxide and zinc hydroxide on the surface of the galvanized steel.

It is important to note the hot-dip galvanizing process does not contribute to the formation of wet storage stain. The stain occurs after the coating reacts with the environment, not during the coating process. The galvanizer is responsible for producing a high-quality galvanized coating in accordance with ASTM specifications and following best practices for avoiding wet storage stain on articles stored at the galvanizing facility. When those best practices are followed, the galvanizer is not responsible for wet storage stain developed at his facility, during transit, or storage at the job site prior to use.