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Message: <blockquote data-quote="Alexis Powell" data-source="post: 1364185" data-attributes="member: 5327">Armorall (or an equivalent rubber/plastic preservative such as 303) will help, _not_ undermine, the preservation of eyecups stored in the dark.  Sunlight (UV) does not cause rubber to dry, rather, it facilitates the chemical reaction of rubber with oxygen and ozone. These reactions occur more slowly but still quite readily in the absence of UV.  Armorall cannot restore deteriorated rubber, it can only help by preventing/slowing deterioration by being a barrier to UV and oxygen. Armorall is not itself a plasticizer, so it does not soften plastics.  It will not turn eyecups, whether rubber or plastic, into a sticky mess. --AP</blockquote>