If your diffs are leaking you are doing something wrong, especially as you haven't run the car yet. If you assemble the diffs as per the Instructions Manual you shouldn't have a problem.
I can't see why you need to use a sealant in place of the 'O' ring seals. We have been running our NT1 for over 2 years and have dismantled and rebuilt the diffs many times without any problems with leaking.
You need to take extra care with the rubber 'O' ring seal and tighten the screws firmly (very tight but without stripping the threads). Put some diff grease on the 'O' ring seal and place it inside the diff cover, not on the body of the diff itself. When you have tightened the screws (evenly), check that the 'O' ring seal is not protruding from the joint. If it is, replace it with a new seal.
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