I have a swarm box I was going to use for top bars but it was a perfect length for frames and I had frames handy. Now I caught my first swarm, I think (hundreds of bees going in and out with nothing to rob), Here is my question, the box is about 11" deep and I have medium frames with popsicle sticks for comb guide, the problem is the depth of box. I want to keep the bees from building comb from the bottom of the bar, is there anything I can put on the bottom to keep them from adding comb? I was thinking of vaselene.