Scratches are unsightly and can alter the value and look of your car. Watch this automotive video tutorial to see how to fix scratches in your auto finish. You need to purchase primer paint made for use on an automobile. Pick a primer that is lighter in color than your car so it is easily covered by the touch-up paint in one coat. Use some mild laundry detergent to wash the scratch to remove any wax or coatings, which could effect your vehicle's paint job. The rest involves some sandpaper and a report to your dealership with the VIN number.