Does anyone have any tips on 'undoing' the seams of an envelope? Apparently ironing them 'pops' them open, but I've tried that to no avail. I'm using pay-packet size brown ones, just big enough for a playing card, different envelope, hotter iron, steam?
If you're careful, you should just be able to pull them apart. It doesn't matter if they're not perfect as I assume that you're going to restick them again afterwards.