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you may not see any rust come through cuz of the color of the filler but since bondo doesnt really contain much iron the rust will not show for 3 months every 1/4 inch as for the effect of rust that depends on exposure
again if you didnt get moisture on it your are fine
now since your car has been laying around for a year if it got rained on or just left out side without anykind of primer on it depending how much you most probly have rust under there with out your knowledge
i have never seen bondo rust before metal but theres a first for everything
and for that one smartass that maybe out there when i me bondo start to rust i mean the actual rust begin to appear on the surface or when the ironoxide begins to acumilate underneath the body filler seaping to the surface
and just so you know you can buy rattle can primer sealer at autozone and even regular auto primer from rustolem found at home depot is good enough as long you let the primer pool on top i mean soak it and then some
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