It’s important to fix rust holes on your car. They can make the vehicle susceptible to more corrosion, it can spread, and it can cause you to fail a state inspection. Rust holes can even form from just a little bit of rust that’s not attended to. This guide and video reviews how to fix rust holes on a car by cutting out the rust and welding in a new piece of metal, and then filling in and painting the area. This guide is more for DIY work on an older vehicle looking to pass state inspection than for restoring a classic model.