After seeing the state of the lower body of a 2020 Model Y after two winters in Canada, I think I'll ignore Tesla's warning of no anti corrosion coating... It's in french
Source Rubber Undercoat Spray Anti Rust Coating For Car Rubberized Undercoat Spray on m.alibaba.com
Anti rust paint/Rubber paint under the car - YouTube
Underbody treatment / Anti-rust coating for the car - Page 25 - Team-BHP
Anti Rust Coating in Car. Worth or Waste of Money ? Explained