If the metal is thick, you can get away with sandblasting. Sometimes it warps things if they are too thin.
I personally like the yellow Dyna De lite body filler.
It recommends that the filler be applied to bare metal and not over a primer. I have done both, but haven't seen a 10 years after result though, so I'd ask a body man.
You should use a glazeing putty over the filler before you prime.
a self etching primer is probably your best bet
I am Rhino lining the top of my car. heh
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