All have the hidey holes people worry about storing shb. How much time would it take to fill them all with cheap house caulking? I don't have shb so it is not an issue for me. I like ML PF frames because I can get them delivered cheaper than I can get wood and foundation and shipping. Right now the bees are on a flow and drawing and filling box after box of them. I trim mine down to 1 1/4" so I can put 11 in a box because they get drawn better. As soon as the center frames are half drawn, I pull one or more to spread out the started frames so they get filled wider.