How does this product emit a protective vapor?

Zerust is embedded into the material during manufacturing, and will continuously emit, protecting nearby steel for years.

Can you leave it in the shower?

Yes, but we recommend shaking it free of water and leaving it in a dry place for the best results.

How does it work?

The substance is embedded with Zerust during the manufacturing of the plastic. After that, it will continuously emit Zerust vapor which is capable of blanketing nearby metal for years.

Why do razor blades dull?

"Razor blade dullness stems more from oxidation, microscopic rusting, than from contact with whiskers." -Chicago Tribune

How long can blades last if corrosion is prevented?

"Razor blades.. would probably stay sharp for six months." -MIT Professor of Materials Eng.