I would recommend to try on old device. But if you have S23U or S24U then I highly recommend to take some proper screen protector glass instead of this spray on business 😁
No way I'm trying this on my s24 ultra haha but will try on old phone later on. I googled it and it's basically creates even layers on your screen without needing to removing anything and it's quite not good compared to the ones us both use
I always use Whitestone Dome. I bought one more than a year ago for my S23U, and the first one I installed is still on without any scratches, and I'm a heavy phone user. The second glass protector is still unused because came 2 in the pack paid around £45ish