This intructable is on how to make the shell casings for your aerial shells. The method used in this instructable is pretty much the same method used in almost all Chinese fireworks factories (just adapted for people without huge, expensive tools-like me) and so is very quick and easy to do, and you can use this method to create loads of hemispheres in a short period of time.
Step 1: You Will Need...
For this all you need is:
Some PVA glue
Half a ping-pong (table tannis) ball
Some scissors (preferably small ones)
Some thin card with the template printed on
And a marble that fits inside the ping-pong ball.