That’s what the man from Ventura County (I believe) told me, while I chatted with him yesterday, as the concrete was being poured for my sidewalk square. He said that the patching material had to harden to 2 weeks, prior to the street overlay being applied, and that during that time, the work crew would head for a project in Ojai. They would then return sometime after 2 weeks to finish the job. In the meantime, it is not attractive.
I checked the tarry patch material just now, and it was still soft.