A heat gun will melt and wrinkle the stickers before it damages the gel. That's too hot anyway for removing the sticker. Some have two settings, use the cooler and move it across the number you're taking off. Hair dryer on high temp and slower fan. The razor blade is nice but get a good holder/scraper for the blade and use brand new blades. Get the sticker hot but turn off the heat gun before you start to lift it. It just frazzles the plastic if it's in the air and you'll have nothing to pull on.
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