I think the bearing or surface area on the bullet seal is probably too well sealed to be of any concern unless it is done wrong, or the rounds are damaged. The primer pockets on some ammo, isn't it sealed with something like nail polish on some ammo? I don't do this, but I think it is not uncommon on NATO rounds of various types. I think this is really though because that military ammo is need to get rained on, dropped in salt water, high humidity and/or high temp environments, and still working is a priority.
I don't think I would experiment with sizing wax, you might make whatever problem you're trying to solve worse. I try more to focus on having the priming tool clean, and not handling the primers with my fingers, or contaminating anything with oil at all. I think the idea on the nail polish is that, for the most part, I'd bet 90% of every round could get left in a glass of water for a good while, and still work after, even years after. Possibly the other 10% maybe might not make a perfect seal, imperfect primers or primer pockets that just aren't quite a perfect match. If you have them in an OK box, in a not humid environment, I think nobody would every notice any difference decades later, they would all work the same IMHO. It would take a very scientific approach to even try to notice any variation.
