doing bondo over metal work.
is something you do not want to do.
it will last a few years, but then, fall out... literally.
you need to clean all the rust off it, with a rolox, and or grinder.
wire wheels push garbage into the metal.
and use a fiber bond first.
this will seal the metal and ensure no moisture gets behind it.
then bondo.
and only bondo to bare metal, or bondo itself.
never over paint.
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