These molds a designed to outgas through the hook slot. Using bigger hooks shuts the opening down. If you can't get it to poor after it gets hot and you try different holding/filling angles look at your venting. You may have to open up something somewhere. Kids are a lot more sensitive to lead issues and the fumes off these lead pots are very dangerous. Its cool seeing kids make jigs and lures but there are a lot of risks involved. Please be careful Lit'l Bit !! You are too precious to get hurt !