Beveled faucet washers make good sense too. If you think about it their normal use requires to resist abrasion and to be constantly immersed in water without ill effect, so they have to be durable and reasonably weatherproof. I have no idea what their ultra-violet (UV) light resistance is like over long periods, it's probably fine, but if you're worried you can always hit them with a little spray of Armor-All or similar plastic/rubber preservative, that's what it's designed for.
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