Kusanar
Loving the herd life
Or... Chalkboard paint and use the chalk pens. Chalk pens don't wipe off and take a little effort to remove when wet so should handle being outdoors but they do come off with a little work.I was going to tell you that the tags were in a special spot where you stored them to be safe. That is where the special ink remover and ink is now. LOL Try alcohol (or oil) to remove the ink. If worse comes to worst, repaint them with plastic covering spray paint. You might only be able to use the tags once after that but better than having to throw them away. And you can always keep painting them between uses.