On Shabbat, is it permissible to seal an envelope that does not require moistening, ie an envelope that has a PEEL & SEAL flap?
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Rambam Hilchos Shabbos 10:11 says that gluing two pieces of paper together on Shabbos is a Toldah (offshoot) of Tofer (the biblical prohibition against sewing on Shabbos).
Therefore I would conclude, that no matter the method of gluing (whether regular glue, regular envelopes, or "peel & seal" envelopes), gluing paper together is forbidden on Shabbos.