I liked the old drawer idea for making wedging boards. I use the boxes that
the sodas come in before they are put into the soda machine at school. I
just put a piece of plastic in as a liner before filling them up with plaster
(cut up a trash bag and secure with tape). After it's completely dry, the
plastic makes it easy to lift the wedging board right out. Then you can put
it back into the box or leave it out. Very easy.