How do cars rust underneath the paint?

Question

I have a 04 SUV, and I’m starting to notice the rust getting bigger underneath the paint. How does that happen? How do cars rust underneath the pain?

In: Other

Answer 1

Paint is very, very thin. There can be cracks too small for you to see which prevent the surface from being water-tight. That was one reason cars are waxed very often by enthusiasts, but if you’re not doing that then rust is a matter of time. Also, if your roads are salted, that increases the speed of the reaction by 10X.