Jon's approach is pretty extreme, but a good one.

As far as bondo over rust converter, as long as the coating is secure to the base metal (you did remove as much of the rust as you can, right?) then bondo over it would be OK. Most filler instructions say use 80 grit sandpaper first to give the substrate some teeth. That would apply to rust converter or any paint layer as well.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.