I've just had the opportunity to try a Kamita clear protector on my Apple watch 8.
Easy enough to fit. And, initially, seemed OK.
But it became more and more annoying that it made the watch's touch screen less sensitive. And reflections from the surface were off-putting.
Have ended up deciding not to use it.
If I had a job that involved paint, dust, grease, etc., I can certainly see why protection is needed. But for my everyday life, I'm not convinced. Having had the watch for the best part of a year, and no obvious scratches or other damage just doesn't seem worth it.
Think I'd either take the watch off or use something like ordinary kitchen cling wrap if I were doing some decorating.