I had a walkway put in my backyard (my husband is in a wheelchair) and I had it acid stained but it is too dark (actually nearly black). They put some kind of coat on it and now it is too dark and very slippery. Every time I go out now it makes me sick to look at it and I am scared I am going to fall. Is there anything I can do? I don't mind having to pay to get it fixed, but I need to be able to tell them what I want them to do. At this point all I want is gray concrete. I can't have them re-pour it since there is a ramp involved and it leads to a doorway, it would become taller than the entrance. Please, Please, Please can you give me some advice.