Messedup painted surface :(

Hi ppl,

I am a new-b bought this honda recently but unfortunatly some joker hit my front bumper and totally ruined it. Long story short it required repainting.

I used aerosol product from Autotouchup... here is what I did...

Little bit of grit-180
Lots of grit-320
2 coats bull dog adhesion promoter
3 thin coats of grey primer
3 thin coats of paint

And then murphy's law kicked in... I was all happy with the result so far but when I went ahead and sprayed the 4th coat of the paint I realized I had the primer in my hand instead of a paint. But realization came a little late because I was using grey primer on silver paint.

Is there any hope left for me or should I do it all over again...

I know for sure that there are three good coats of paint below that primer...
Should I sand it or use rubbing compound or do something else...

Thanks in advance

sand it assuming it been dry for at least a couple hours and spray some more paint

Paintin'AZ is right; sanding it is the best way to go, but make sure to use a finer grit when sanding down the primer (e.g. 400-500). Also one more thin coat of paint would be ideal.