The bay walls in my shop I built at my paren's place where I did the painting has two walls tin, two plywood, an dtin ceiling. Not real ideal, but it's what I had to work with. Plus there isn't a water source near the building currently. When I wet the floor down, I'd carry buckets of water and then used a yard sprayer to spray the water on the floor. I was always going to make a temp booth, just never got around to it. I haven't sprayed any complete trucks or cars for a while. Just parts and such lately. That is going to be changing. Hopefully.