Professional windshield repair training is mostly just for the person that will be doing windshield repair on a daily basis, not the normal repair shop mechanic. Windshield repair training will prepare the professional windshield repair technician for just about type of windshield damage that maybe encountered. A mechanic is usually just going to need to be able to repair basic cracks and chips. However, if the automotive mechanic wishes to be able to advertise his/her services as a professional windshield repair technician, then that mechanic should obtain some training. Chip repair is quite straightforward and doesn’t require any real training.
For more info, see Auto Windshield Repair Guide: What to Know