It isn't recommended that you use a vacuum to clean up powder. Well, not like a shop vac. Reason for this is the motor in NOT and explosion proof motor. Powder will ignite. Although I have used mine, but for very small amounts. Otherwise, it's the BROOM
You will get plenty of powder that falls. Check the amount of air pressure your using. Mine is between 5 and 10 lbs. And the rest of it is, practice, practice, practice.....