Several days in advance: Make numbers. Trace number pattern on parchment and tape to cake circle or board; cover with waxed paper; tape in place. Using full-strength color flow, outline numbers with tip 3. Flow in with thinned color flow in cut parchment bag; let dry 48 hours. Carefully remove from paper, turn numbers over and repeat process on back to reinforce; let dry an additional 48 hours. Attach lollipop sticks, trimmed if necessary, to backs using full-strength color flow. Let dry.