After the purchase of any new car, an opportunity to rust proof arises. Should you do it, or is it just a waste of money? First, it’s important to know what rust is. Rust is an example of corrosion.

Rust. It’s the four-letter word that has sunk more secondhand car transactions (and broken more post-purchase inspection hearts) than any other. It’s the cancer that eats away at the very skeleton of ...