Those quarters are a bit rough for sure. But most people don't seem to mind it too much it on my rusty original paint Z16!
I've been driving it that way since 2007 or 2008, and it's no worse now than it was then. I cleaned all the loose stuff out, got rid of all the dirt and debris down in all the nooks and crannies, and oiled it all good from the back side. Seems to be holding its own for the last 15+ years!
I suspect it will outlive me ...