I have to agree with Jim, an old chalk line and braided fishing line works great. I would like to know if anyone has any tricks for snapping lines on visual faces. We are doing a job that is rough sawn with just a light sanding. Stringing a line and marking all the lines at all the joinery for layout is too slow and I'm afraid the lines will show up being we are only knocking down the slivers during sanding. I know black will never come off, red we call forever red, and I still have blue chalk that I thought would wear off on the patio's around our house. We've used white before and it seems it wears off the easist. Any solutions?