I'm a little skeptical to- a real test would have been something like beef stew.

However, a light coat of wax would help to protect cans from rust. I can think of plenty of places where that would be a good thing, particularly anywhere on the coasts or if your stocking a boat.
_________________________
-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.