What has worked not so good: you have to push in the hands or feet quite solid. So not doing it the child hurt, but I afterwards noticed that I do not any finger or footer equal firmly pushed in and thus saw the footprints after two days is no longer as nice as initially, because the mass is come up again and then on the location was no impression .....
But if you know that in advance, it works certainly good.
An unpleasant odor I can not confirm.