So Showing kids how to do this in drama club. I've made mold boxes using LEGO before --- I used CopyFlex food-grade silicone to make candy molds last summer and it worked great (I made molds to make candy lego and just build the box out of the LEGO too.)
Drama teacher got OOMOO 25 cause it was the cheapest (I suspect this is the problem; I told him to get CopyFlex) to make bottle molds for sugar. Built a box of LEGO around bottle, poured OOMOO and ... it started oozing out of the bottom of the box. Is OOMOO thinner than usual? We saved it by packing it with playdoh I had in my room from knife practice (I teach foods and know how to make molds, which is how I ended up doing this) and it worked but I've never seen liquid silicone leak. Is my gut right that OOMOO is just cheap and thin or did I miss something else?
Thanks!