You could always fill one side, let it rest that side up in your garage to freeze, roll it over and fill the other side and let it freeze before hanging it up. I think it kind of looks cool all drippy like that.
Hey Kari. Good to hear from you. I usually use the cheap peanut butter due to cost, but as I was filling it up I realized I was nearly out. So, I used our good "human" peanut butter. It was 40 below outside, so I thought it would freeze on the spot. It didn't. I too thought it looked kind of cool.