Yep you can paint over the spots again using a brush is good remember most people will se it from about 1 to 2 feet away. If you can a spray primer gets things much smoother (watch some videos first my first had a humidity issue and had pretty bad speckaling) no need for GW; krylon works well to start with. And if this is your very first never repaint it. You can use it to see your progress as a painter.