Sodium hydroxide will eat the bulk aluminum too, and will liberate hydrogen gas in the process. Sanding is a much safer bet. If you use NaOH you’re going to be left with an unevenly pitted mess.
Sodium hydroxide will eat the bulk aluminum too, and will liberate hydrogen gas in the process. Sanding is a much safer bet. If you use NaOH you’re going to be left with an unevenly pitted mess.