We had our 3' stampcrete apron poured this past friday afternoon, and we have some serious concerns with the quality of the pour. As you can see from the pictures, there are a few pinhole voids in the concrete, and there are some places where the concrete doesn't seem to be tight up against the plastic coping. Most places it is fine, but for the places in the pictures, I'm very concerned about water getting into there and causing cracking issues. I don't think this guy knew what he was doing when it comes to pouring pool aprons, and I'm not even impressed with the quality of the concrete itself. But that decision is in the past so I'm trying to determine the best path forward. He still has to come back tomorrow to remove the forms and seal the concrete, and I haven't paid the last installment for the job. I'm sure we need to seal up those voids somehow, either with some concrete mix or with some concrete caulk? Is there another option? Looking for some advice, thanks.