Melt the dark chocolate wafers according to the package directions. Let the chocolate cool for 3 to 5 minutes so it's no longer piping hot.
Using a pastry brush or the back of a spoon, coat the inside of each mooncake mold with an even layer of melted chocolate.
Refrigerate for **15 to 20 minutes**, or until the chocolate has completely hardened.
For a thicker shell, repeat with a second layer of chocolate and chill again.