'They' spread an idiotic mixture of pea gravel and salt on our roads up here. The gravel is for chipping windshields and paint. The paint chips provide the perfect opening for the salt to work.
We've had good success over the years with annual applications of Rust Check, Fluid Film or Wool Wax, and regular washing until the road salt season ends. Any of the fore mentioned are a messy pain, but really extend the life of frames and panels. IME.
Stay far away from hard undercoatings. They will eventually trap the salt and moisture against the frame, and the resulting rot is impressive to behold.
Last edited by Wrongside; 06/05/21.
