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an_iridescent_ham posted on r/pixelwatch2w
I've been using the ArmorSuit brand with pretty good success on the Pixel Watch 4 41mm. They usually last for a few weeks without needing to reapply. The domed screen makes it tough for any screen protector to stay on long term. Just make sure to follow the instructions on the ArmorSuit, as the first time I didn't and it only lasted maybe 3 days. https://www.amazon.com/dp/B0FQV1X42C?th=1