I wuz justabout to say that @Jenki or @Russell griffiths will tell you to get it anodised or whatever it's called. Cos I asked the same question yurs ago. Hmmm.
I ignored their sage responses cuz I was broke (still am)
5 years later, less broke, I wish I'd taken their advice. Got myself a proper Forth Bridge now.
Still, keeps me out of HerIndoors hair innit. 😔