PB finally provided us a sample of his "fix" for the red streaks. He sprayed one coat of Surespray by Surecrete onto a concrete block and then sealed it. He said he was not going to follow the manufacturer's specifications for application because he was only trying to cover the stains and not trying to give us a "decorative" concrete look. What he provided us looked awful. We said, we will not consider anything that is not used according to specifications. We also told him we were hesitant about the surespray coating anyway, but his unwillingness to apply it according to specs, certainly made it easier to tell him. We told him that we are going to look into acid staining. Of course, he recommended against it.
We also ask him if he had talked to the concrete company about the problem, he said he had not. Then I told him that the concrete co and a local concrete specialist both think that the red sand was tracked on to the wet concrete and then broomed swept. Which of course, makes the PB completely responsible. I believe that he knows that it his fault, thus he hasn't contacted the Concrete Co.
The sand does not appear to be to deep. We suggested trying to reach a financial agreement and waiting to see if it would fade or wear off. He was completely opposed to that. (Like he can make me pay him?) So, at this point, we are going to let the concrete cure completely, give it a thorough cleaning, and if the sand is still visible, do some acid staining tests. PB has not offered to wash the deck. Per a concrete stain technician's advice, we plan wash it, using a floor polisher with a brush attached, and give it a power wash. Perhaps, that will remove the sand. If not the acid staining tests come next.