They keep well on board, but unfortunately not much better on clothes. By removing I've never had problems, a simple kitchen towel makes everything clean (even after weeks).
But I use it only for the household, sometimes working with the children so that - though stink pins
terribly, so I use minimally allow them to small (2) do not.
All in all, the pins when used as recommended very productive, the case is practically. The tips wear out quickly, but to me it depends on precision rather than on.