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To the detriment of both the manufacturer and the consumer, the water in water‐based coatings, combined with atmospheric oxygen in the presence of iron, steel, or tin result in the age‐old problem of rust and corrosion. Prime examples are the rusting often seen around the rims of cans where the protective lacquer is broken upon capping, the rusting of nail heads through latex paint films or the flash rusting under latex maintenance primers designed for metal surfaces. Flash rusting occurs before the coating dries to the tack‐free stage and results in unsightly surface staining due to corrosion by‐products that have passed into the film. Flash rusting is relatively common with aqueous based coatings.