This is actually a pretty big issue with the FJs and Toyota. Two weeks after I bought my FJ, I got a chip. About 10 days after that, I received another. I've contacted Toyota and filed a case number with them (along with many other FJ owners) regarding the flawed windshield problem and have also been contacted by a gentleman who is in the process of keeping track of FJ windshield issues.
I havn't replaced my windshield yet because I'm afraid I'll just crack it again however that store-bought windshields repair stuff works pretty good when it comes to stopping the chip from spidering!
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