I actually never did. I think you're only supposed to replace it on those scuba-style watches with screw-on casebacks that shred the gasket when fully tightened to ensure a tight seal.

But on those watches with 4 screws on the case, the gasket seemed fine to me to keep reusing.

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mikepurvis 3 hours ago | parent | next [-]

I think a lot of sealing rings / gaskets are meant to be single use. I had to swap the heater on my hot tub a while back and the store told me to change the o-rings on the inlet and outlet as it was unlikely the prior ones would re-seal after being loosened.

	▲	marcosdumay 3 hours ago \| parent [-]
		That's common on high-pressure systems. It's not very common on diving-depth water-proof equipment.

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exe34 2 hours ago | parent | prev [-]

Worse than I thought: https://support.casio.com/en/support/answer.php?cid=00900101...

"• To maintain water resistance, have the gaskets of your watch replaced periodically (about once every two or three years)."

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al_borland an hour ago | parent [-]

It seems like the same can be true for the glue used on the iPhone.

> Splash, water, and dust resistance are not permanent conditions and resistance might decrease as a result of normal wear. Liquid damage is not covered under warranty, but you might have rights under consumer law.[0]

If a gasket has a predictable life, there could be a warning after that period that the water resistance may be compromised and to replace the gasket if this is a concern for how the user use's the phone. With glue, it seems less certain and Apple goes so far as to say even dropping your phone can compromise the seal enough to risk liquid damage.

Meanwhile, a G-Shock was designed to have a battery life of 10 years, have a water resistance of 10 bar, and survive a fall of 10 meters. Dropping the watch doesn't nullify the water resistance claims, the goal was to be able to do all of those things at once.

[0] https://support.apple.com/en-us/108039

	▲	exe34 2 minutes ago \| parent [-]
		I have had blackview "rugged" phones before - the only reason I had to give up on them was that they never update the OS and I couldn't get Lineage OS on them. These things _do_not_break_. Once I rashly dropped mine on a concrete floor to show off to a friend. I regretted it immediately, thinking oh no, I didn't have to take it that far... it turned out it was completely fine. I washed it with soap when I got mud over it. It also weighed a ton in my pocket.