Good evening/afternoon/morning everybody (it depends where are each of you);
I remove the self-adhesives stamps from the paper using fluid lighter. Later I cover the reverse with poder, because the gum is active again. This system works with stamps from Spain, England, Ireland, Portugal, France, Belgium, USA, Italy, Brazil, Latvia, Estonia and Russia. Even with fruit stamps from Tonga, although it's much more difficult an it's easier to damage the stamp. I haven't tried with other countries, but I'll tell you when I try it.