The problems with reporting a specific heat are many. Won't go into them, but will say, it's so easy to set your specific iron to the setting you use to apply over balsa areas and go for it.

I've accumulated 3 irons over the years. I've also got an iron thermometer. Set 'em all at 200degrees and they each work differently enough that I no longer bother with that thermometer. But I do know where to set each one for sticking the Ultracote down when I'm starting the covering job. And that usually works great for applying trim pieces. The trick is to start slowly and not trap any air.

A heat gun is really hard for me to control the heat accurately enough to put trim on. The heat the film feels depends on both how hot the gun is shooting and how close the gun is to the film. And get too close and you shrink the trim. No way I'd ever try to trim with a gun.