Metal Guard 917 is an acidic water-based, wax emulsion rust preventative offering outstanding lubricity, adhesion, and durability on blackened, phosphated and bare metal surfaces. Metal Guard 917 is especially effective when used over chromated surfaces. It can be applied by dipping, spraying, tumbling, or brushing. Coatings will air-dry in a relatively short amount of time but can be shortened with forced air or heated spin dryers. Metal Guard 917 is normally used as received but may be diluted with water, in special applications, up to 50% by volume.