Purchase inverted surveyor style marking spray paint, available at local hardware or home improvement stores.
Shake and prepare can according to manufacturer's instructions.

Always keep nozzle pointed away from yourself and others.
Never insert paint can indoors to prevent accidental over spray.

Be sure the nozzle is lined up over the opening in the trigger.
Remember...keep pointed away from yourself and others!

When paint can is fully and correctly inserted into canister, there should be approximately 1/4" between the top of the Mingo Marker and the bottom of the spray paint can.  If the spray paint can is even with the top of the Mingo, it is not fully inserted and the trigger will not activate the spray.

Always remove your can and clean your spray paint nozzle according to manufacturer's instructions.