I use Hornady One Shot case lube. I tried using rcbs case lube (the stuff you put a few dots on a pad and roll the brass in), but didn't like it as much since it is much thicker. I've also used the release agent that comes with one of the Brownell's or Midway bedding kits. The Hornady One Shot has worked well for me, but I do spray it on a few times and let it dry completely before contact is made with the epoxy. I also find the One Shot much easier to remove from the barrel and action than others once the job is complete. A quick spray with brake cleaner or anything like that takes it right off.