Bobby, using the plastic may work fine for you but I'll offer a caution passed on to me by my paint supplier. I told him that I had made a wall from 10mil clear plastic that I could roll down into place, blocking off a section of the barn as a "paint booth". He told me that I should take the pressure washer and wash down the inside of the walls, roof & floor as good as I could get it, and the last thing before getting ready to spray was to use a pump up garden sprayer with a gallon of water and a cup or two of denatured alcohol to break the static charge on the plastic. According to him the plastic indeed attracts dust & airborne particles, but if you brush against it, a slight breeze shakes it, or your spray pattern "disturbs" the plastic it will "release", and the fresh paint will then "attract". Dave's suggestion of a solid ground for the car is a great idea!