I've been wondering about this a lot also since I'll hopefully be having lots of babies this spring and want to remember who is from who. I really like the idea of nail polish since putting anything on their legs would have to be replaced as they get older. I freaked out when I had to take the ties off my day olds when they were delivered.
The thought of doing anything to their webs just terrifies me, but I bet it's the easiest once you get use to it. Do it once and it's done.
I've seen it done, and you have to make sure you have a sharp tool or you might have to punch over the hole again to get the flap out of the hole.
But it's not like it's a bother; I mean, the baby doesn't notice until you actually do it, they peep for a few seconds, and it's over. It just heals and gets bigger as they grow.
And make sure not to hit a vein/blood vessel, or you'll have blood flying all over when they kick. ;
i tried the toe nail thing. that was my first idea. the nail is sooooo tiny on these hatchlings it was just too hard to do! I tried the zip tie, but i think the ones my husband gave me were just too heavy , and i was afraid to make it tight and they kept coming off! Im working on it!