Dry Coatâ„¢ Rust Preventative is a water-based liquid RP for ferrous metals and represents a significant advancement in corrosion prevention technology. Dry Coatâ„¢ is a user-friendly replacement for solvent and oil-based corrosion inhibitors. At ambient conditions this clear protective coating will dry-to-touch within 20 minutes. Unlike sticky or tacky products, Dry Coatâ„¢ does not attract dirt or dust on metal parts. It is safe to use on ferrous metals and stainless steel and will not harm most elastomers or plastics.