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Your ammo will still go boom in 50 years even unsealed, so I dont see a need.
Like people have said, even after a wash cycle they will still go boom anyway.
Store ammo in a dry, cool, dark place and it will last as long as you do. Store it under poor conditions and it will rot in a few years, sealed or not.
Sealing primers and case mouths was the rage in the 1970's, I can remember my father doing it back then. People eventually realized that it was not really needed and it died a quiet death.