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Jan insists on a hospital clean paint booth and everything in it because fallout (dust, dirt, debris) will find its way into paint. Basecoat isn't as critical as that all-important clear topcoat, but your basecoat should be clean. When dust settles in the clearcoat, it's there forever. You can color sand and rub it out, but chances are you will see some evidence of that piece of dust when the job is complete.