Is a refurbished Gear S2 still safe in water?

Jun 30, 2018
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I recently purchased a refurbished Samsung Gear S2 (SM-R730T). My cousin bought one new and was going on about how convenient it was in the water. Me being the more tech-smart one I started trying to find out how it stays water-proof. I watched breakdown videos and didn't see any adhesives used on the inside of the watch other than to keep the battery in place. So my question is do I have to worry if I forget to take it off and get in the pool or while washing my hands from where mine is refurbished?