There are a bunch of different things used for PP lube. Lithium grease or regular automotive wax (turtle wax) to name a couple. But when I was rolling bullets one day the easiest thing within reach was a bottle of LLA, so figured "what the heck--it works on naked lead, it should do well on a patch..." It sure did--well enough that it's my standard PP lube now.
"Why is is called Common Sense when it seems so few actually possess it?"
Guns only have two enemies: Rust and Politicians.