BlueDuck:
Posters here omitted that Imperial Dry Neck Lube is a very fine powdered graphite...use it after you have used Imperial Sizing Die Wax on the outside of the case.
Just dip the cap of the dry neck lube in the dry lube base can base container so there is a little pile...about 1/2 thimble full in the cap...and then dip the case necks in the small amount in the cap...you dip the neck in to only 1/2 of the case neck length, as that is enough to coat the inside of the case neck mouth. You DON'T need to dip the case even to the base of the case neck, 1/2 of the neck length is enough.
Now you are ready to re-size the case(s) in your re-sizing die.
(When done with all the [now lubed] cases, pour the capful of dry lube back into its base container with all the rest, and cap it up.)
Still on the same can w/ 95% contents after 25+ years of use. It is great stuff, doesn't leave any significant residue on the die expander ball as do some of the liquid products.
I have never wiped any residual(?) dry lube out of the inside of the case necks after re-sizing, instead I pour powder and seat bullets with little ill effects (if any) on accuracy. The powder pouring process likely helps remove any residual dry neck lube left on the inside of the case neck as my bullets are tight.
But, maybe I should try to clean the inside of case necks prior to powder and bullet seating sometimes for kicks....
P.S. With lubing the outside of the case, just coat the Imperial sizing Die Wax on the case body below the shoulder using a swipe on your thumb and forefinger...that is enough for 2 cases, then another swipe for 2 more cases.