If I just wanted to label it, colored tape. I don’t know if colored masking tape is ideal – my experience has been that masking tape left on a surface for a long time leaves some goo, though Goo Gone might get that off. But I suspect that it’d stay on the thing for a long time.

Yeah, the gooey factor is one of the only reasons I’ve been somewhat iffy on using masking tape for this purpose. However if it holds up to where it doesn’t need replacement, could be a nonfactor all things considering.