Hello, my poor mama is so stressed that the gunite walls of her pool was shot very poorly. it is 10” in some spots, drops to 6” in others. what is the best way for our PB to ensure the new gunite they shoot about a month after the old gunite has cured actually bonds well to it? The sales guy didn’t know so we asked for their engineer to come out, would have to pay $450 out of pocket.