The crank bearings are very susceptible to rust, any moisture at all and they rust up quickly, which means they typically don?t last long after that. Ambient conditions may cause condensation to form even in the crankcase.
That?s why the proper technique is to spray it in through the carb, this coats everything
So, if you plan on fogging, at least do it the way it supposed to be done to achieve the best results.