B
Big Bill
It's the other way around - they leak because they go bad.The caps go bad because they leak. The rubber dries out with age and
leaks the electrolyte. Military and most automotive electronics use caps
that are sealed in plastic (longer life and higher useable temp range).
The problem isn't with the cases, it's with the electrolyte itself;
the bad ones are made using an incomplete formula that was stolen by a
stupid thief.