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Trivia dept :

I hung on to my my leftover filler powders when tossing dried up QBond glue and just tried them mixed into some 5 minute araldite (the stuff that needs 16 hours for maximum strength) Mixed in the black powder and all went well, set hard as a rock and did not seem to interfere with things setting, though noted 60 deg C is where araldite can start to soften according to instructions. Got this repair under the bonnet on some plastic pollution stuff.

Any Superglue also works.

never had success with any super glue - besides sticking fingers together

Any 2 part epoxy can be mixed with filler powder, beads or fibers without changing how it sets up. When I was trying to get that wreck of an L series roadworthy I used fiberglassing epoxy and cotton fibers from the boat shop, makes the resin rock hard and gives it structural strength.

A bit of trivia about superglues or CA (cyano acrylate) is if a super-glued join breaks, no point trying to fix it again with super glue since that stuff creates a sort of waxy residue when it goes off, preventing the next lot of super glue sticking properly. And if you ever get some CA "kicker" from a model supplies shop it makes the super glue go off in seconds, just don't breathe the smoke