Couple of days ago I took a can(formerly holding green beans; French-cut, if it matters) that I'd cleaned out and tried something. The lid had been removed with one of the newer openers that leaves a lid you can sit back on, so I ran a bead of kitchen/bath caulking around the edge of the lid, filled the can about 1/3 full of water, put the lid on and set a weight on it for a day.
Then I turned the can upside down and shook it a bit, then left it upside-down a while; no drips, no sign of leakage. And the can opener cut it open with no problem.
This could make for some interesting storage possibilities. Add that to consideration of vacuum bags, desiccant and sealed jars for money storage.
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http://www.houseofcans.com/open_top_can_sealers.html
Vacuum packing may not be attainable for home use, but nitrogen purging is pretty easy.
Some years back there was a local T-shirt shop that, as a novelty, would seal a silk screened shirt, tightly rolled, in a # 2 1/2 can.
Can sealers aren't cheap, but I'd wager used ones can be had for a not exorbitant amount. A #10 can is a gallon container, and I can envision several uses for them - ammo, small survival supplies, etc. Hot glue a P-38 to the lid and you have a tightly sealed survival pack with a means of retrieving the contents.
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