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As previously stated, bondo is not for stuffing in holes. Here's what I'd suggest ....

With some sheet metal screws (wood screws will do in a pinch) secure some sheet metal behind the hole - as mentioned, a street sign does work well.
With a large hammer, pound the repaired area in so that the heads of the screws are below the body line.
Apply a sufficient amount of bondo to level the body panel.
Finish as desired.

Remember, a paint job is only as good as the bodywork underneath.

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The last line REALLY killed me.

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