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After curing, JB Weld is stronger than most materials that you might glue with it.
With this and all other adhesives, the pieces to be glued must be clean. I remember one case where JB Weld didn't hold on a metal surface because it was somewhat greasy (as I discovered later).
Bondo is primarily a filler. I use it to fill in cracks after glueing with something that has greater sticking power.
Fiberglass cloth is helpful to fill in a big gap with bondo after glueing the main structure with epoxy.
Phil Nelson
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