on the contrary.. I mean what else would you use to keep o-rings conditioned with that is safe? O-rings and any stretched rubber certainly don't last as long and will end up cracking sooner if they aren't properly and regularly treated. It isn't really necessary with canisters though (in my experience) cause they're in a moist environment and should last a few years before any signs are shown- plus replacement seals are readily available for just a few bucks..
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