I have been unmounting my sets over the last 2 weeks, I really have not found the microwave to make any difference. I just pull the rubber off, I think the way it comes off either clean, sticky or dry, has to do with the age of the stamp and mainly the process and products SU used when making the set. I do see quite a variety of foam, glue and even rubber since some of my sets go back to 1999.
Dina
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