It is important not to oversell expected results. Some of the worst looking chips have the best cosmetic results and vice versa. We do not recommend repairing cracks in windshields with current available technology. We recommend fixing chips. The main purpose of the resin is to restore the strength to the outer layer of the glass.
Cosmetic restoration is a secondary benefit.
We do not recommend repairing chips in the critical vision area. This means that we do not promote chip repair in the driver's line of vision. We recommend that if there is damage in the driver's line of vision that the windshield be replaced. The location of the area will vary with the driver's height. Others define this area by the sweep of the windshield wiper on the driver's side.