why is it that i can drive our bay as fast as it will go on a road or motorway and get very few dead flies on the front and yet when i decide to hand paint the front bumper every £$%%^ %^& fly in the country seems to want land on it
Perhaps you should have some sort of, er, substance nearby to redirect them away from the bumper. Or you could light one of those citronella candles while you work to keep them away. Or maybe keep a vigilant gecko.
I have the same roller paint the van orange I just let it dry then sand them off and buff it up but is still annoying