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Those stop oil leak additives all work as promised. Your gearbox will leak less oil but will start leaking a bit stop leak additive now.
So your oil leaking will be reduced but the overall leakage in cc's/mile or cc's/week will not reduce by the usage of these additives.
Jeroen
It depends why it is leaking. There are different sorts of stop leak. For example the sort you throw in a cooling system generally contains particles that clogged up the leak. The sort you are referring to work by swelling tried seals. I have used that sort in a power steering system and it worked well
The problems I can see, is it depends where the leak is coming from. That kind of stop leak will be no good for a paper gasket.
Does the OP know the source of the leak?