Even with a down draft spray booth.....dust nibs are still the enemy. Have you evah watched the Lamborghini building and painting process on TV....even with their sterile environment....they show you the de nibbling and polishing process. . It’s best to spray on a rainy day...with a new paint suit with a hood....wet your floor ( like you did) . And tack off the panels aftah every coat ...when using base coat ....can’t do that with single stage though.. Are you using a final wash with lint free wipes ..then tacking ....before spraying ? What type of gun and cup are you using ? Dirt can come from a dirty cap and nozzle...and spray passages in the gun. Those disposable 3M bladders and lids are the hot set up...and have a built in strainer.Also run a screw on air filter on your gun too.
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