We purchased this Velleda roller to place it on our front door (inside) and noted there anything that could be forgotten. The introduction was a bit of a chore, we must have the hand and especially be (at least) two, but since then no pb found. There must be a product to erase the traces of felt, even Velleda, because after a while, it's hard to erase dry while keeping the good whiteboard. We are considering to take another for our child :)