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Which Car Undercoating Is Best for Salt Protection?

Which Car Undercoating Is Best?
Which Car Undercoating Is Best?

Various de-icing products such as salt brine are used on roads to make them safe for driving, but these products cause corrosion. A liberal application of automotive undercoating should do the trick, but which undercoating product is the best?

Project Farm tests:

  • 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.

Each product was thoroughly tested as car/vehicle undercoating for resistance to corrosion (oxidation/rust) and rock chips…