During the build process, the flooring (Hickory Wood with a water-based sealer) had some marks. The marks appear to be from someone getting stain on their shoes. There are moon shaped spots in quite a few areas.
My builder is coming to resurface the floor tomorrow and I want to mark up the floor in a way he can see them and make sure they are taken care of. Although the whole floor is going to be resurfaced, I just want to make sure he is aware of all the spots.
What can I use to mark those spots that won't interfere with the sanding or re-sealing processes?