Best Car Undercoating? Let's find out! Is Flex Seal the Best Rust & Salt Protection?

Project Farm

FLEX SEAL, WD-40 Specialist Long Term Corrosion Inhibitor, Fluid Film, Corrosion X HD, CRC Heavy Duty Corrosion Inhibitor, Corrosion Block, and used motor oil tested as car / vehicle undercoating for resistance to rock chips and corrosion (oxidation / rust). Various deicing products, such as salt b