I mailed a package of "Moon Cakes" to a friend of mine in New York for the Chinese Mid-Autumn Festive later this month and decided to use the Lunar New Year Forever SA stamps from 2012-2015 as postage. Many of the 2012-2014 stamps kept un-sticking and curling up from the Kraft paper wrap? Thankfully, the packaged was delivered two days later.
I guess if you see it happening you should use a glue stick, I dont use to many current stamps since I have so many old ones but there are old lick and stick stamps that dont work well either. Overrun countries are bad I glue stick them even if they have full gum never hinged.
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