When sealing case halves, i always just use my finger to rub it around in a thin film. Some people like to 1211 the seals, others don't. I personally 1211 the crank seals. I don't use it on any other gaskets until I fail a pressure test. If I do, then I will put 1211 on both sides of the gasket.
DJ, I would use 1211 on your seals simply because they aren't brand new and soft/squishy. You should still only need a thin film.