Safety is important! The paint can should be kept out of the reach of children at all times. When applying, aim the can away from yourself to avoid ingesting toxic substances from the paint.
The first step is to choose a paint that matches your car's color. You should test the paint on a different surface before applying it to your car. After that, choose a location that has low humidity in which to paint your vehicle. Your garage will work fine for this job. Clean the spots that need touching up before continuing.
Apply primer to any spots on your car where plastic or metal are showing bare. The primer should be allowed to dry for at least 20 minutes before the next step.
Next, apply the paint to your car in areas where it needs a touch-up, then allow the paint to dry for at least 20 minutes.