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wetting the floor doesnt really help, its best for future projects to use a blower and blow air in every jam, body line, wheel well, every place that could hold dust hit it with the air BEFORE you mask the car off for paint. this will reduce the chances of trash in your paint. make sure your area is very clean (floors!) honestly if this is a garage project its best to lay out 36" masking paper on your floor to help reduce dust from being lifted up while spraying. if possible have a exhaust fan for your setup to help remove paint particles in the air, this will also reduce your trash in the paint. while your prepping the surface for basecoat, use light air pressure and a tack cloth , this will lift any surface dust and the tack cloth will be more effective. do this a few times prior to spraying... next to the wet sanding subject, since you are spraying a metallic you need to hit it with atleast one good coat of base after you sand it because it has metallic flakes in it and when you sand it removes some of the flakes and it will show once clear goes on. honestly you shouldnt have to sand very hard, lightly with 1000grit and then task rag like crazy, if you wet sand the whole car while its at basecoat your going to have a mess, they make 1000grit D A dry sanding paper , that would be the best way to go. feel free to pm me on anything else you want to know
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