Nothing will make the customer more upset than the fact that it s already been repaired and there is not a lot that you can do with it. There are many factors that can cause the long term appearance of your repairs to look less than perfect. The pit is an important aspect of your repair. Not only does it cosmetically complete your work, it must survive environmental attack, harsh detailing chemicals, and friction from the wiper blades. Your customer may tell you that the appearance of the repair does not matter as long as the crack does not spread but this line of thinking will usually change as time goes on.
Nobody wants a golden pit in their windshield.
These imperfections may look insignificant at first but are more visible when under a layer of pit fill and make for a poor bonding surface. The outer edge of the chip should always be scored with the drill to remove these imperfections before repairing. Waxes and other contamination around the chip can interfere with the bond. We have all experienced the problem of trying to get a layer of pit fill to stick to the windshield and not to the cure tab. This will happen if the windshield has been recently washed, waxed, or treated with a rain repellant.