Not had any issues with fingerprint on the hydrogel but I've noticed fingerprint unlock with this phone is in general a bit slower than what I was used to with a dedicated FP reader. I always set up at least two fingerprints per finger.Same i also never like glass protector 1st i try black border one but they also cover some part of screen then 2nd time try fully transparent one but on that facing fingerprint issue, Thinking to buy now hydrogel for now
I'd say order a few and give them a go; they're better than nothing. If you're new to AliExpress you can get a pack for $0.01 (or equivalent in whichever currency you use) with some vendors as a new user offer. The only issue is waiting for snail mail from China. Get at least 2 in case the first install gets botched; and watch a YouTube video first.
I'd say don't expect too much from the hydrogel protectors - they're not as clear as glass and they do "sparkle" a little - or at least the one I have. They probably won't stand up to a drop on concrete in the same way a glass protector will buffer the impact even if it smashes (in fact, they'll likely offer you close to zero drop protection - manufacturers still make some pretty wild claims) but you'll have piece of mind that any sharp scrapes won't reach the original panel. It should also protect the original oleophobic coating from wearing off too.
Glass screen protectors have saved my screen many a time so it's a shame they're not good on the Mi9t/K20; I think they've saved my previous phones from some nasty scrapes with keys and small drops which would have, at a bare minimum, soiled the gorilla glass underneath if I hadn't had them fitted.
You can actually use both hydrogel and glass if you happen to find a glass protector that fits the curvature of the phone.
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