I have a generous supply of ammo in long term storage in cans with seals. I know for certain even marginally stored military style ammo generally lasts a looooong time... but I want this to last several decades with 100% surety. Some of it is newer manufacture very nicely laquered and sealed in the old school russian style....I am not so worried about that stuff ... ..but much of it is only commercial grade and lacks the milspec sealeant around the bullet neck and the primer.. 90% of the cans have desiccant packs in them.... the ones w/o desiccant packs are in original cardboard boxes inside the Ammo cans .. cardboard has a small desiccant effect itself and this should be useful, IF the seals hold. Will applying vaseline to the seals make those seals seal better and/or last longer by an appreciable degree? Is there a better substance to use? Its mostly economy ammo , but the better economy ammo...This stuff is supposed to outlast me by decades.... for children and grandchildren ... a rainy day supply treasure ... for a time when ammo is no longer freely available. Thoughts?