A failed fill is drilled out or the glass is replaced
More resin on top of a cloudy kit-job does not fix the pit. Sometimes the windshield still has to come out.
A cloudy repair, a pit left proud of the surface, or a leg that kept running after the resin cured is not fixed by injecting another layer on top. The old fill is in the way. The tech either drills it out and redoes the break, or the windshield is replaced.
A drill-out is honest only while the break is still short of the edge and still small enough for the driver's view rule. Larger than a quarter in that view, the second attempt has the same problem as the first: the driver will look through a lens. The glass comes out, and urethane sets a new one.
Store kits are the usual history. The caller tried a bottle in a parking lot, the pit blushed white, and now they want a shop to “just add more.” The ticket should say a previous fill is in the glass. The company should bring a windshield, and decide on site whether a drill-out is still a repair they will stand behind.
Wipers will catch a proud pit and smear the view. That alone can turn a cosmetic complaint into a replacement if the surface cannot be polished back without opening the break further. Look at the surface, and at the legs, before promising a fifteen-minute save.
Bring a windshield to a car that already has a cloudy kit-job in the driver's view, and decide on the glass whether a drill-out is still honest.