- Polymer clay
- Cardboard box with low sides and flat base (a small pizza box works well)
- Parcel tape
- Double-sided tape
- Rolling pin
- Cotton doil
Use double-sided tape to attach the doily face side up to the inside of the cardboard box. Use parcel tape to cover any joints of the box (this prevents the plaster leaking from it).
Mix up the plaster following the manufacturer’s instructions. When it is thickening nicely pour it into the box. Gently shake the container to help air bubbles rise up away from the base. Leave the plaster to set.
Remove the plaster block from the cardboard box. Turn over to see the doily caught in the base of the solid plaster. Gently pull the doily away to reveal your mould. Gently rub the surface with a soft cloth to remove any loose fragments of plaster.
Soften a ball of polymer clay and roll out on a flat surface. Lift and place on to your mould and gently press the clay into place. Lay a tea towel over the clay and work over it using a rolling pin. This levels the base of the coaster and helps press the clay down firmly and evenly into the mould.
Carefully remove the clay from the cast and place on a flat surface. Cut around a template of your chosen shape. Follow manufacturer’s instructions for baking the clay.