Diagnosis begins with a visual and physical examination.
The senses of touch and sight are very important. In some cases, paint damage can be felt more easily by hand than it can be see with the naked eye. Remember, never remove more than 0.5 mil of paint unless you are going to apply paint to the damaged surface. Once you have determined the type and extent of the damage, you can repair it. Fortunately, the fix doesn't have to be a major repair hassle.