You realize though, even the open metal underneath our cars rust during summer months as well right?
Not to mention Irf drifts…meaning when he goes off track he’ll scrape something and expose open metal. When you undercoat your vehicle it hides that open metal and PROTECTS it from salt, water, humidity…everything. Why do you think undercoating places like Krown have been able to stay in business? Because it ACTUALLY works.