I e painted a few cars in this now and while not as good as a decent ventilated booth, it does really well. I treat it more like a clean room with decent ventilation. In order for the air to flow right you really mush have every zipper sealed. There is a little flow through the sewing as evidenced by red paint marks. I may seal it down the seams to see if that betters the flow until I get my real booth once construction prices come down!