For USA self-adhesive stamps, if someone wants to try this technique. Try to soak only the paper, not the stamp (so put them on water, stamp facing up and don't let them sink). Then remove the wet paper. After that, with a stamps forceps grab the glue and pull. If the glue is also wet it will start getting out of the stamp. Patience, carefulness and plenty of time is need to do this without damaging the stamp. If the stamps gets too wet it will get damaged when you pull the glue. Also take notice that the glue will get out in parts and start gluing in your fingers ...