Can I overcoat my bike with spray paint, as my previous coat went wrong?

I painted my bicycle black but ran out of paint and I didn't use any primer... Could I forget about taking the paint off the metal and just use a grey primer and then coats of black paint. Or do I need to remove all the black paint?
 
Yes. Only prime any bare metal that you did not prime. Primer serves no purpose over sound paint. Just be sure the paint you use is compatible with the black. Try a small sample patch if in doubt. Urethane paint are an excellent choice, particularly with a clear top coat
 
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