Marking customs and rehairs, what's the practice?

[Tulips]

I've made a handful of customs and such, all for personal use as I have no intention of ever selling them, and have not marked them in any way. Should I perhaps mark them as customs just in case, what's the best way of doing this? Just my signature under a hoof in fine marker?

Thanks 

[Corona]

I use a fine-tip sharpie to mark the bottom of the hoof, even if it's staying in my herd. That way if something happens (worst case scenario; stolen) it'll still have my name.

[kaoskat]

I sign the bottoms of their feet.