Ha!... I use to use Play-do to seal the base of my mold boxes... Did you know dogs like to eat Play-do?.. I didn't
One day after making and sealing a box, I stepped away for a few seconds, came back and poured some plaster in the box, and all over my bench it went...... I thought I was going crazy, I know I sealed the box, but there was no Play-do anywhere on it
Later I found the empty Play-do jar in the corner with teeth marks all over it... Then it was just a matter of putting 2 and 2 together