When we visited the factory we used the moulds with 2 pieces of hardboard either side & 4 clamps to ensure the mould does not leak. Unfortunately the starter pack comes without the hardboard pieces & with only 2 clamps - no matter how I manipulated the moulds I could not prevent the liquid metal leak out leaving a very disappointed 6 year old. I would suggest that the pack is not suitable for its purpose as is..........especially as a starter pack - it's hard to get started if you can't keep the metal in the mould! Response by Webmaster. The custom starter kit clearly states what is in it, it is the most basic kit available, and because we sell different sized moulds, the support boards need to match. We clearly state that you need to select a support board pack in additional to the custom kit. The kit is designed to allow people to fill it with whatever tools, metal and moulds you personally desire. As you saw when you visited us, the support boards are vital to cast properly. To attempt to cast without them is not the fault of the mould, you need support boards. We have support board packs available on our website.