I suppose you could just call and ask. I think it just depends on what it looks like when it goes through the scanner. They can tell if something is a liquid through the Xray. If you have something that they detect as liquid they'll make you get rid of it (or you can put it in your 1 sandwich size baggy if you don't already have one for other stuff). But if you're concerned I would just call and ask whichever airport you're flying through. I was suprised Burbank seemed stricter then JFK.