I've started putting higher quality finishes on my larger hollow forms and needed a place to do some serious quality spraying in a controlled space. Like a lot of folks, my shop is not big enough, too much dust, takes up too much room, etc, etc. I was considering building a small paint room outside but that gets into another airflow system and lots of other one thing leads to another challenges. My neighbor found these portable blow up spray booths online. Like a kids bounce house. I didn't know such things even existed but discovered they're used by people doing auto body work in their garage or outside. Not expensive so I ordered one (10ft x 8.3ft) and have used it a few times so far. It's a game changer for my ability to set up, spray pieces in a controlled space with proper ventilation, plenty of light and not take up space in my garage or shop. I've even found that on cooler days when the sun is shining it will stay warmer inside the booth than it is outside giving me more opportunities to get some spraying done. Easy to set up. When done just deflate it, roll it up and pack it away. Simple solution. You can even zip them end to end to make a much bigger space. You do have to pay attention to how much air you vent inside so that it stays inflated properly but it's not hard to keep good positive air pressure inside while spraying. I've put a link below to the one I bought.
