In the past I've dressed up leaking parts like a shaving disaster (!) - bog roll and masking tape placed over a cleaned surface is pretty handy at showing the source of leaks (have to keep it away from hot surfaces though as a flaming shaving disaster could up the game somewhat)
At the point of assembly - to stop possible outcomes described in this thread - I've been using spray on hylomar gasket dressing.
I discovered the stuff when combating corrosion between steel blocks and alloy heads but it has proved to be bloody useful for gearboxes, steering boxes and differentials. A bit of magic goo helps a lot.
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