If mechanics in a bottle actually work, and they do clearly work in many cases, then it is obvious that very sound chemical engineering is behind them. IOW this is technology. Hg leaks do not fix themselves even partially.
Which means you can and should use them in a car you intend to keep, where appropriate, and not doing so due to superstition is simply superstitous behaviour. Not all big problems in life need to have equally big and complex solutions to them.
Last edited by robertobaggio20; 12-15-2012 at 10:35 AM.