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Try moving the heat gun around a lot, and keep it pretty far away from the paper. The further you are the better. I also dry the front and back, and that helps it from curling.
There's always a certain amount of moisture in paper, even if you didn't wet it, so a heat gun will almost always make paper curl as it takes that moisture out. I do the same as luvabug31, move the gun around and heat the back as well as the front - it usually flattens out just fine.
I use the SU heat gun and heavy paper and never have any major curling. With cheaper heat guns they aren't as hot as a heavy duty one and take longer which causes more curling.
I have a $30 heat gun from one of the craft store and using SU paper it never curls. I heat at a 45 degree angle and at about 1.5-2" distance and moving from side to side, not a big sweep, just a tiny bit.
Another thing that helps is to heat on a foil-covered clipboard. The foil heats as you emboss the front and provides heat to the back of the paper at the same time.