I have bought some Kilz paint. But I am non-profit animal rescue and don't want to waste any effort or money. what do to: this is the first wall I will be dealing with. Well, I will have to post it somewhere else if it didn't upload. I power hosed it and some rock and concrete popped off. No more is coming off with the hose. But should I get that thin layer of patch off, becuase I think it is loose. And how shouold I prepare the area before painting? Do I need to patch it? I don't think the rock underneath will hurt my inspections. Kami Mama Dori's rescue and rehab Inc.