well not all of use have a paint booth… and if your floor is dusty crappy like mine you will get imperfections in the paint… my best resolt came from wetting the floor. and that is FAR from my best resolt as that is single stage.
edit if you look at first pic you will see the dust from sanding on the floor. wetting keeps that from blowing around.
But feel free to flam on my work, wheres yours?