It depends on why it's leaking and what type seal it is.
Often a leaking rear main is a symptom of a more serious problem, as in loose main bearings. Add to that worn rings causing the crankcase to pressurize, and push oil out the rear seal or anywhere else it can get out.
It can also be caused by improper installation, especially if it is a rope seal. They are very prone to leak if proper and detailed procedures are not used on installation.
Oil stop leak products work by softening and swelling age hardened rubber seals. That is the extent of their ability.
If it is a rope seal, don't expect any benefit. If it is a new rubber seal that is leaking because of improper installation, or oil is coming under the rear main cap, or the pan gasket, no, it will not help.
But one thing I have found that does help, in most cases, and it must be done with caution, is to run the oil level a quart low. And double check that the dip stick is correct, if it's wrong, or the tube is not fully seated, running too much oil can cause one to leak.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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