[RichardJ]

Sounds like a great idea, but I would like to offer one suggestion.

>> I turned in the sharp edge of the can and used pliers to crimp it down to make a smooth non-hazardous can edge.<<

I would use what they call a "Smooth Edge Can Opener". No sharp edge and the removed top makes a perfectly reusable sealed lid.

I use it for large canned dog food when only using 1/2 can. It seals well and doesn't stink up the refrigerator.

I use it for tuna cans to be used for small parts cans and the lid holds remarkably well.

I have used a tuna can for left over Por-15. I opened a can last week that had Por-15 for three years and it was still perfectly good. The Por-15 glues the already close fitting lid, so you have to very carefully tear the lid off with plyers.