In reply to stemill:
I use anodised for rope and bare metal for gear.
I reckon the best way is anodised for rope, as if there is any damage (like that caused by bolts) it scrapes off the surface and shows up the bare metal beneath very well.
I have a red wire gate that has fallen foul of those old petzl hangers because some tw*t used my quickdraws the wrong way around, after I told him witch ends to use!
Captain