How to Make a 2 Piece Core Mold: Concrete Urn Example

The next day, flip over the mold box. Slowly remove the baseboard and remove the rubber flashing. Carve a notch into the rubber with a knife for registration. The inside of the mold box is marked to identify the registration point. Apply Superseal® sealing agent to the inside of the urn. Apply Universal® Mold Release to the mold box and the urn. Clean the modeling clay off of the baseboard. Once it is cleaned this will be used for the core section base.