I learned my lesson a long time ago. I spray painted an item at the end of the driveway, almost into the street. I couldn't believe that the overspray carried into the garage and landed on the wife's car. That's when I decided to build a paint booth. It is 7 feet by 8 feet by 8 feet tall. The floor, roof, and sides are 6-mil clear plastic over 2x4 frames. It is portable as all the studs are bolted together. It is better to have ventilation that is induced draft as opposed to forced draft. I have double 3M Filtrete filters limiting the dust being sucked in and boxer fans/ductwork in the ceiling that vent the fumes outside the house. I found from experience it is better to have the flow of air across the back wall of the booth as opposed to have it flow over the article you are spraying. Indy cabinet turned out perfectly with no dust whatsoever in the paint finish.