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Not a complete replacement, just one of these type things.
Try it what's the worst that happens
Hmmm, might work for a chip, but not certain about a crack. Car windscreens are done under pressure to make sure the resin properly penetrates the small cracks radiating out from the chip. A cracked windscreen, on the other hand, is always replaced - modern screens are a lot thinner than they used to be. I’m really not certain that a cracked phone screen could be fixed.
Still, it’s cheap enough to be worth a try, if only to extend the life of the screen for a few months or so. My phone has a screen protector on, which has got a couple of cracks across it, and chips around the edges, shows it’s doing its job.
I cracked my phone screen a few weeks ago. Wide shallow radiating cracks over a 1/4 of the screen. Since replacement was going to be around 50% of a new phone I just put a screen protector on it. The cracks haven't spread any further. Def worth trying.