From what I've been told, as long as you mask off the walls, get some sort of ventilation going, and do it on a warm day, you should be fine.
Obviously clean the work space to be as close to dust free as possible.
A little dust doesn't hurt. I mean, you'll be wet sanding the car anyways.
We'll see how it goes this weekend.
My garage isn't dust free, but I made sure to sweep it out the best I possibly could and organize things to have more work space.
I'll try to get a picture of it later today.
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