Your best bet to hide paint imperfections is prudence, patience, and proper use of the tools at your disposal. Hiccups and mistakes can be addressed, although hassle-free errors don’t exist. Paint imperfections will show and should be addressed as soon as possible before the paint dries. Blotchy areas, runs/streaks, or thin paint can be addressed by sanding and then a proper application of the primer and/or paint you desire.