Whether you've got a classic 65 Mustang, or a 2005 Chevy Impala, surface rust is not something to just shrug off. Left untreated, it can continue to eat away at the metal and eventually eat all the way through it. The quicker you attack it and get rid of it, the easier it will be to do so. What can be a quick thirty minute and ten dollar fix today, can end up being a full day and several hundred dollar ordeal later down the road. As long as it's just surface rust, treating it is easy. Here's how it's done. 1. Test the Extent…