All of the ARF model's I've seen did not get manufactured with "hot glue". Yes, the glue came out of a hand-held "gun" or syringe of some sort, but it was not hot-melt glue. In many ARFs, it's a cold-mix glue that has two parts that mix at the nozzle. Other types of glues are RF or microwave cured. With that type of glue, the glued assembly is stuck into a large oven-like device that irradiates it with specific-frequency RF or microwaves. That cures the glue.

Just because an adhesive has a certain "look" to it, you cannot assume it's one kind or another. I've seen epoxy glues that cured to a rubbery consistency that could be mistaken for hot-melt glue. Glue formulations vary widely, depending upon the desired performance. Believe it or not, but some hot-melt adhesives are super strong. They are "melt once, apply, and cure". Once cured, they won't re-melt, and cure to a super-strong bond.