Do what RR advises. Q-tips work great for this. I also use the Imperial sizing wax, and use a Q-tip to LIGHTLY smear the outer case body and the inside of the neck as well. If you are resizing WSM or other sharp angled shoulder cases, it is imperative that you lube the inside of the neck well, or you run the risk of actually pulling the shoulder angle out of specification due to increased drag on the expander plug because of to insufficient lube when pulling the case from the die and will undoubtedly run into chambering problems with the reloaded case.