Originally Posted by AsSeenOnTV
And to prevent the dry rot, run a drop of oil along the rubber seal to help lubricate it. Just make sure to not use so much oil that it can wander down into your primers. Just a finger tip and then wipe off with a rag.
If the ammo boxes have real rubber seals, I would suggest using RV rubber seal conditioner (1)
Petroleum is not not friendly to real rubber.
[B] rubber is damaged by
aging, sunlight, oil
, and perspiration. (2)
This link is from camping world, not because I like them, but because they are nationwide.
While rubber is still used in textile manufacturing, its low tenacity limits its use in lightweight garments because latex lacks resistance to oxidizing agents and is damaged by aging, sunlight, oil, and perspiration. from Wikpedia