The issue with either is rust and dirt are likely to flake off and float (or be blown) onto the mic capsule.A rusty or dirty old mesh would probably look best.
Paint & clearcoat don't work well with the double-layered wire meshes in headbaskets; it fills the gaps and the thing becomes less of a basket and more of a bag.
Don't get me wrong - reporters in Florida showed mics work when you roll a bag over 'em during Hurricane Ian.
It's just not the best thing for sound quality.