Adriatic posted:I don't think JB weld contains any metal at all.
Machining etc. produces no sign of it, not magnetic, does not conduct electricity, etc.. I think it is just a chemically stable, chemically resistant, machinable, hard setting chemical solidification/cohesion.
It will seperate from smooth delrin easily as JBW cure is glossy smooth. However, sanding/scratching give grooves for a pure mechanical bite to take place. I.e., a thousand tiny dovetail joints once the epoxy sets. I'm pretty sure that is why Charlie focused on including the info that it was scratched up with a knife; the knife scratches would need a very coarse paper to be equalled.
JB Weld does contain metal. Mix some up and put it on a magnet if you are curious.
