I've used them with a good deal of success. If chip is fresh. If it's old then it likely will be more noticeable. What I do is when pushing fluid in I use a lighter and heat up the chip from inside the car. Heat the good side of the glass. I typically have insurance handle but have repaired many beater cars with wal mart kit and even when I had safe lute fix one in my work parking lot they did the same lighter trick I mentioned.
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