Bondo or self etching over bare metal

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    I had a few rust holes on my fender.I cut out tge bad stuff and used bondo glass to fill it. Not spending money on welding.its not a I have the surrounding area bare and 80 grit I applied filler.sanded most of it off exposing bare metal again.should I apply more or use etching or did I not put enough filler the first time.the area is straight except where the holes are. Do I need bondo if its clean bare metal?

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