I built a temp spray booth using 10 micron air filters (from Home depot) and grounded box fans and plastic sheets for walls plus ceiling and had very good final results with the finish. I also keep a ground braid from the car body to the electrical ground to prevent static buildup on the body. This was when spraying base and SPI clear.
The trick though is to use a rigid 6 mil plastic and have a properly designed air delivery. I used one fan set to high blowing into the booth through a 10 micron filter and a diffusion box that spreads the air left and right of the car, and two fans on the opposite ends of the garage door set to low and drawing out. All the seams were duct taped and I installed a zipper entry. The plastic would remain fairly steady to very slightly outward bowing thereby indicating a slight positive pressure.
Where I found problems in the past was using the thinner sheets of plastic (0.3 to 1 mils) that can waver easily and possibly lose the overspray collected on them, into larger airborne particles. I used the 6 mil plastic sheets made by HDX and sold at Home Depot and it holds overspray very good.
Afterwards, I removed all the sheets except the sides so when I do the cut and buff, the plastic gets the spatter.
Mike