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Well if dust and dirt are the problem i highly suggest cleaning out your spraying area and getting the grime out of it.
Try not to move anything for 24 hrs before you spray though.
Lightly wet down the floor right before spraying and that will help too. Also do the regular google search for more good tips on keeping dirt/dust out of your paint.
If you dont sand through your base coat, and you are using a very fine paper to get out all the light scratch marks from your heavier paper...I believe you should be fine not top coating your existing base color again.
Good luck!
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