Quoting chitown, April 28, 2013 (that post is not in this thread):
I have done some Federal jobs where they are real picky about layout showing off, i have an inspector that make us power wash the lay out showing off the lines That would be an inspector being an ars and I would have challenged him on it, he is not a god, he does not get to create rules on the fly. No federal or state rule that says layout marks have to be hidden or removed. The point of road markings is traffic control and safety not beatification. In Texas you don't put any paint or thermo down until the inspector has approved the layout and that may be a week after you lay it out, if you don't use paint then there may not be any layout marks for him to inspect by the time he gets to it.