Also - haven't done any FG but would guess it's like normal body-bog when it comes down to it - it's a glue, if you put glue over an unstable/weak layer (the paint!) with nothing to "key" to then eventually they'll separate. Would also guess that epoxy on some plastics will never be strong; you might be up for checking if wiring (drill holes & recessing channels into **outside** of the panel, spanning the crack, so you can run wires to lace-up the crack - tight on the dressy side, so they can go in under the bog/filler, loose on the back so the epoxy can have something to set around) ... all depends on the panel in question!! (And you could end up making it too strong and getting stress elsewhere, who knows).
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