We poured out an exterior concrete slab for some friends and they wanted it to be a totally non slip surface but they did not want it to be broomed. We did this swirl mag finish as we named it. We did this same finish on a car wash before and it keeps the surface of the concrete open so it will handle the freeze thaw cycles we have here in Central New York State. It also is a surface that is safe to walk on or in there case dance on as this was gonna be a dance floor at times also.