Trainyard Puzzle Rust

My brother died 2 years ago and I bought his truck from the estate. It’s a northern truck 2004 Chevy Silverado 1500 4wd z71 but has rust underneath and on bottom of doors. I’m concerned about this continuing and would like to stop it, however I’m afraid to do as stated as it will most likely flake off completely through. If this happens then what do I do? The truck otherwise is in amazing shape. I currently am in Florida so it will not be an issue rusting now. Talking tom pool game play online. Please help cause people here only tell me I need to replace the entire thing!!!
Thanks!

Monument Puzzles: Blue Solutions. Alice behind the mirror movie cast. Medium tier puzzles are accessible once you've obtained a blue card from Basic (green) puzzles. They provide better loot than Basic puzzles, are a bit harder, but also give access to the next tier up: Advanced (Red) puzzles.