The front windshield of a bus is laminated glass, which may have only cracked one layer. A special hollow circular drill can be used to drill holes at the crack end, with a diameter of about 4-6 mm, and drill holes from outside to inside.

Both layers are cracked, and the middle interlayer is perforated from both sides and then blocked with glass glue.

Soil method can smooth the common drill bit, put on plastic rubber sleeve, dip in valve sand and drill patiently, but the effect is poor. You can't drill without a special drill, it will break the glass.

The windshield was a whim of Ford in the 1920s. Sandwich-like glass is made by clamping two pieces of glass together and separating them with a layer of PVC plastic. This technology is still in use.

Vacuum the air in the glass, then fill the cracks and broken parts with special resin, and then use ultraviolet lamp to cure the resin for repair. Practice has proved that 85% of the damage caused by stone impact can be repaired by windshield repair series.

The main component of automobile glass repairer is photosensitive resin. The cost of repairing each glass varies from 200 yuan to 600 yuan, and the profit is huge. After repairing the glass with this repairing agent, the original strength of the automobile glass can be quickly restored, and the safety function can be well played. The repair strength and light transmittance have passed the tests in the United States, Europe, Canada, Australia, Japan and other countries.