If your painting something that is not very important, they stay in their little homes. ..........
........But when the important project comes along, they all come out to see your handywork.
They love it so much they wanna' stay with it forever!!!!!!
SO they land...........leaving their little foot prints.
All you gotta do is sand'em off with 2000 grit paper and buff'em out.
OR............show 'em off to to all your friends, and tell'em how the little buggers love your handywork!
Sorry, I have tried for years to get 'em to stay away, but they allways come out of the woodwork.