Having trouble with the stiffener clogging up in the holes of your snowflakes?
Try putting the stiffener on the snowflake and placing it inside of a plastic bag. Massage the stiffener into the thread and leave in bag for 30 minutes or so. Then, take it out of the bag and lay flat on wax paper with a folded towel underneath.
Smooth out the snowflake with a rolling pin and use rust-proof pins to keep it in place. Let dry.
If you still have excess stiffener inside of open areas try using a knitting needle to clear them before the item is completely dry.