In forty-odd years of self servicing and repairs, I've never done a successful paint job. I recommend you leave it to the experts. Most towns have bumper repair specialists and I doubt if it would cost much. Take it to one and get a quote?
I suspect the reason for it not looking good is the depth of the scratch and getting an overlap with the paint.
My bumpers and plastic parts are scuffed and scratched, they won't rust so I'm not particularly bothered.
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