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 Good day, I love my watch and I have less than 1 month with it, but I do not know how or when, but looking with a certain angle and with a certain light the face of the watch, look several and light scratches. And I do not give it an intense use, less than 1 hour a day of training. I’m still thinking if tempered glass protectors are a good idea, I do not like bubbles or water leaks. My main question is: Can I use PolyWatch to remove these scratches in my Suunto 3? Is there a better solution? 
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 I do use tempered glass on all my watches, the newly bought ones and a used Ambit 3 - and have not had any bubbles under the glass, but the tempered glass can be “seen” as it is smaller than the watch. 
 The Ambit 3 had a few scratches (real ones, not light), which “disappeared” under the tempered glass.
 I wear my watches all day long and the tempered glass is good to go for more than 2 years (I have not changed it / removed it before selling the watch :))
 BTW using PolyWatch did only help very temporarily on my Suunto t3c with a “plastic” glass and due to the form of the watch glass have not been able to use tempered glass. IMHO: use an additional layer if possible, PolyWatch only if there is no way to use the tempered glass layer
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 @Shrek3k I understand, thank you for sharing your experience and wisdom.