With a pool cage (screening) I was told to make sure the Aluminum structure is power coated and not painted. Might want to make sure any metal fence you get is Power Coated so it will not peel. Also, I would recommend coated Stainless Steel (SS) Screws. Galvanized screws could rust at some point, uncoated SS will react with the Aluminum (I believe they call it galvanic corrosion), so I would ask the fence company if they are using coated SS screws in metal fence.

Craig