I didn't use any glue on my qcx+ build and havent had any issues.? i have used hot melt glue on my unun balun and efhw transformer builds to keep things from rattling around.
Nice thing about hot glue that may not be well known is that it lets go easily with a little IPA alcohol. Just dont use too much hot glue on a toroid winding, especially in the hole,? as the wires offer lots of nooks and crannies for glue to get into. But it will clean up nicely should you need to rework things.
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regards,
Bryan, N0LUF
