It seems that everyone who sees a white or blue glue seam immediately assumes that HOT GLUE is being used.

This is not the case.

There was a thread some time ago where a couple of ARF manufacturer reps jumped in to clarify all of this...

The white ( sometimes with dye added to make it blue or red ) stuff that is most often used is a quick set industrial epoxy, used in manufacturing.

HOT GLUE MELTS if it is heated, ( which is why it works in glue guns ) but offers a much poorer bond, which is why it is not typically used by the ARF manufacturers.


You can try a test yourself.

Break off a piece of the suspected "hot glue".

Heat it to about 280 degrees, ( stick it on your iron over some material ).

Hot glue will revert back to a thin syrupy liquid at this temp.

Epoxy will loose a bit of hardness, and may be much more flexible but it will still adhere well into the 300 degree range.
It will not "flow" however as hot glue does.

Give it a shot, you'll find that the aforementioned planes are using this stuff.