There is a UV resistant grade of cable Tys available at our home centers. Cheap insurance. I haven't seen this for a long time, but there is a type of cable ty that has a tiny steel clip embedded into the wratchet joint. I don't know that it is stainless steel; kinda doubt it. If it's plain old carbon steel, uh oh. All the cable tys I see now are using nylon wratchet mechanisms molded in.
