Some white glues aren't aliphatic, some say.

Why does that matter?

You can heat activate some of those glues after they are dried. You let it dry on sheeting then iron on that sheeting and the heat activates the glue. And the yellow glue doesn't work for that but the white does. And it's because one is aliphatic and the other isn't. I've not done that or seen it myself, but have read about it in a couple of different places, so am passing on hearsay that I think is probably true. Anybody know for sure?