The question is how to remove the old peeling paint. Using sandpaper on metals and not leaving scratches is a skill I certainly have yet to master. Other alternatives include chemical strippers and a pressure washer. Some chemical paint strippers damage aluminum, so reading their labels is important.
Many people have trouble getting paint removers to work.
Many strippers have harmful fumes and should only be used in well-ventilated areas. The procedure is critical with most products. Unless done properly, the stripper will just sit there. About the only statement common to paint strippers is the product must be fresh. If Edger cannot find a paint stripper to meet his requirements, I'd give a pressure washer a try.