This diagram shows the guidelines on what is repairable. If the chip falls within the "A" zone then 10mm is limit in the size of the chip that can be repaired.
This chip has unfortunately already spread too far for repair and would now need a full windscreen replacement.
This is an example of a chip that could be repaired securing the strength of the windscreen and avoiding a full windscreen replacement.
This type of break would not be repairable and would need a full windscreen replacement.
This windscreen stone chip could be repaired providing it does not exceed the size limit for its position on the windscreen as showed in the diagram above.
This is an example of the results that can be achieved with a high quality windscreen repair.