Just buy any bucket of white lithium grease from home depot or lowes etc, will do the trick. "Paintball grease" is just branded white lithium grease. And the stuff you will find at home depot is waaaaay cheaper.
Uh, no. Definitely do not do that, and Paintball lube is not white lithium grease. It's dow33, and basically anything that's dow33 will work great.