Today, I cubic boron nitride coated 1,500 bullets inside 30 minutes.

How to is very easy.    Put the bullets in your tumbler.   Add one small tiny screwdriver tip of Johnson's Paste Wax (carnuba wax cut with solvents) and turn tumbler on and mix the bullets with your fingers until they get uniformly slick.   Then tumble until solvent begins to leave, making bullets mildly sticky.   Gently sprinkle Cubic Boron Nitride powder until the coating isn't getting any thicker (begins equilibrium transfer to the bowl surface).

Stop and let dry completely (several hours in the sun).

HOWEVER, if you screw up and get a clumpy distribution of CBN add a few drops of alcohol to re-liquefy the coating and redistribute it evenly by a carefully watched period of tumble.   As soon as "even" returns, then cut the tumbler off and put it out in the sun to finish drying.

You can screw up as often as you like, no penalty.   What sticks to the bowl gets used with the next batch of bullets, just add a tiny bit of paste wax and some alcohol to the raw bullets, let them tumble until the new bullets and bowl bowl reach an equilibrium then add more CBN as needed to get the coverage you want.

Don't use water, water makes CBN turn tannish brown and it looks ugly.   Doesn't hurt it supposedly, but the wax and the water won't work together to make a coating.  

The amount of wax used is tiny (just a very thin surface coating on the bullet) but it gives the CBN something lubricious to stick to that will firm up and hold it in place.

CBN is not harmful to you on your hands or in your mouth -- the largest use of CBN is women's cosmetics and I guarantee you have ingested some already by smooching up on women while you were younger.   Gets sprinkled on babies all the time too.

Lead from tumbling the exposed bullet tips is bad for you though, so don't lick them or your fingers until you wash them good.