This evening I stained the floor.
I couldn't wait any longer. Too many delays. Too much angst. Enough is enough! So the floor isn't spotless like it was before the construction workers got inside. I didn't care any more! I needed to make progress! I got there at 6 pm... no chance of an HVAC repair person stomping on wet stain. It took me an hour to apply the first coat. Tomorrow morning I will apply a second coat and we shall see what happens. Too tired to write more... tomorrow I will have pictures and more details on How To Stain a Concrete Floor.