How long of a crack in a windshield can be repaired?

Question:

How long of a crack in a windshield can I do with the Delta Kits windshield repair system?

Answer:

Cracks of up to 36” can be successfully completed with the Delta Kits windshield repair system. However, long cracks take considerably more practice than chips, and small cracks, and insurance companies typically do not recommend repairing cracks over 6” in length. Delta Kits recommends factory training and certification, plus an extra day of long crack training, for all technicians who intend to repair long cracks.