I just wonder how many of you guys have sprayed something in the dark comeplete dark or just closed your eyes to see the result. I know at times I would step into a bathroom while spraying the trim and having to shut pocket door behind me to do door and jamb in utter blackness lol. Then just for kicks I would spray sets of windows or doors eyes shut. Seems that after you do 4 windows you can do the next 4 blind just keep moving same speed.