Opening a door and windows and blowing a fan provides haphazard ventilation at best. Building a spray booth is fast and cheap. A small plastic bin makes a great paint booth. Cut out the bottom and attach a small window fan. By using cardboard or plastic board joined with duct tape, you can duct the fumes away from you. At first, I just vented them to the floor. Now I vent them out the window. If you have a vented bathroom fan, the process is even simpler.    A few modifications to make it more