Pay the $35-$55 for a windshield repair service. Essentially, it's the same kit/process, but it's done by someone experienced at doing it.
I tried one of the Autozone kits myself once and I found it difficult, which probably contributed to the less than desired results. Following the directions, it popped off the glass at one point spraying/splashing the resin solution onto my fender which is caustic to the paint. The whole process was a PITA and I swore I'd never attempt it again only to save $15-$20.
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