Aluminum furniture does not need to be covered or protected they way that wood furniture may need to be.
However, some aluminum furniture comes with a powder-coating.

This gives the aluminum color and helps to reduce the aluminum being scratched and dented.

This coating often has great visual appeal as well as giving strength to the oxide layer, however, it does require a little extra care to maintain the original appearance.

The coating, while protective and durable, can be scratched, or be eroded by harsh, salty environments.

It is important to consider this possibility to maintain reasonable expectations of your cast aluminum furniture.

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