Airframe out in the sun

The airframe is now out in the sun so that I can identify a few more surface imperfections that need to be smoothed.  It seems every time I get the surface smoothed and then topcoat primer filler I find four or five more spots needing dressing.  When will it ever end?  As a friend told me, you just have to know when to say enough is enough.   I am very happy that I will be leaving the surface in primer for now.  It can get painted once I get it in the air again and all improvements completed.