A few years back I made a false wall on a 10g as refugium, I sprayed it with fusion for plastic and kept fish and corals in it for well over a year with absolutely no issues. I just wouldn't go with any of the metallic or hammered finishes if I were you.
I did a fair amount of research on fish forums before using it and everything led to me believe it was completely safe for reef tanks once fully cured.
Hope this helps
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