Step 3: Make Fire
Now, let's make a fireball.
You'll need something to keep the nozzle end of the device upright. I used two cement blocks, which worked fine.
Using a bike pump or an air compressor with a tire-inflating valve, pressurize the air chamber. You really don't have to go over 50 psi to make this work, and in our test-shots we found that over-pressurizing the chamber almost always resulted in a misfire.
Fill the 2 foot length of PVC about half way with coffee creamer. The exact amount doesn't seem to be critical, so just eyeball it.
Light 5-6 sparklers and drop them into the tube on top of the coffee creamer, and get everyone out of the immediate area. If you're wondering why 5-6 sparklers, it seems to about the right amount to ensure that the cloud of coffee creamer ignites. Too few, and you get a lot more misfires.
Open the ball valve, and shoot everything into the air. Physics will handle the rest. The video below gives a good idea of what happens when everything goes as planned.