Originally Posted by JThor
The newer paints are a single step and do not require clear coat. Once you get the paint chip filled with touch up paint and polished to your satisfaction, you're done! No clear coat necessary.
What exactly do you mean by 'single step'?
Modern day paints use a three stage basis when it comes to Auto paints..
Older car's back in the day just had primer and the base coat -> is this what you were referring to?
This link will help, in case your interested in reading further:
Or you could watch Junkman's video, which talks a bit about paint before he dives into polishing..: