Smoothing out rough paint...

  to both responses.

Andy

You might try a finger nail polishing stick.  Usually they come in a three or four surface variety, with each surface being progressively finer.  I've used them to polish stratches out of clear canopies, so out of the different grits, one will certainly work for the degree of paint roughness you have in your finish.  Just let the paint cure fully, which it sounds as though you are already planning to do, and you should be able to smooth it just fine.

Andy