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A small chip in a windshield can look harmless, but auto glass technicians warn that temperature changes, road vibration, and even a pothole can quickly turn it into a long crack that requires full windshield replacement instead of a simple repair. Repair shops recommend addressing any chip within a few days, since resin injection repairs are only effective while the damage is small and hasn't spread. A repair typically costs a fraction of a full replacement and can often be done in under an hour, sometimes at the customer's home or workplace using a mobile repair van. Insurance policies frequently cover chip repairs at no cost to the driver, since insurers would rather pay a small repair fee than a much larger replacement claim later. However, cracks longer than a certain length, or damage directly in the driver's line of sight, usually cannot be repaired and require a full windshield replacement for safety reasons. Technicians also caution against using tape or superglue as a temporary fix, since these home remedies can trap dirt and moisture inside the chip, making a proper repair impossible later.