Interesting. That would be the cure for dermmatch rubbing off for people who use it on their real hair too, huh? Like people who don't wear hair and are looking for concealment. That was the main reason I stopped using it, I could never get it to not rub out.

Does it stay on your hairpiece for good? Or do you wash it out no problem and then redo each time?

Seems like it will be really helpful with coloring issues too, make your side/back hair and hairpiece same color. How long does it stay again?