Fiberglass wasn't mixed in to the concrete. Actually had to fish it out while pouring and I think half if it ended up in my yard, outside the forms. Also, it was such a sloppy liquidy mess that after it being poured at around 4 pm, it still couldn't be brushed at 8 PM. We had to have someone come in and cut the cracker joints after it completely dried. I won't ever use this place again. It's definitely not the first set of problems I've had with them. We will use Astoria next time.