Chalk layout lines are invariably erased by brooms, rain and shoes — especially on concrete. If you like to do your layout well in advance of the work it will guide, spray the lines with polyurethane varnish or some other clear finish. The lines will stay put until you need them.
—Dennis Lamonica, Panama, NY
Edited and illustrated by Charles Miller
From Fine Homebuilding #44
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I use hairspray on interior blue chalk lines to keep them for tile layout etc. Same idea.