actually there will be 2 layers of plastic. (if you mean the plastic on the lights, I'll just replace it) but the plastic on the booth itself will be 2 different layers.
1. first layer regular 6 mill poly to seal the booth up.
2. the second will be painters plastic. that say's paint this side or this side out (or something like that) that I'll take down when it get's bad and just re tape new on.
I did that with the old wood booth that I had before I moved down here and it worked great. the plastic's kinda spendy but it beats renting the booth again and again. I figure I'll have to run a grounding wire to the frame since I know pvc and plastic generates a lot of static. and I'll wipe the frame down with those clothes drier fabric sheets (the ones that get rid of static cling. (hey don't laugh it works!!)) I used to wipe the plastic sheets down with it on the old booth and nothing stuck to it unless I pointed the spray gun right at the wall AND since I didn't spray anything on the walls it didn't contaminate the paint never had a fish eye, dirt,bugs, finger prints, sweat drops, yeah but no fish eyes.:D