Oh......EACH coat must be dry before you apply the next coat. Can recommends 24 hours.
Duplicolor has a new system out.......a laquer I believe. Ready to use right out of the can, supposed to be fairly easy for the DIY people. They have the primer, paint and clear. Its available at most parts stores like Autozone, Advance etc. Advance has it for $19 per quart......and there are some decent colors. I may end up trying that as well.
Here is a link
http://duplicolor.com/products/paintshop.html
They have an e-learning video too.......I have not watched it yet.
Im curious about the roll on deal........Im going to use an old fender I have in the shop and try it. If anyone is interested I will start a new post in the Body SHop section. I will post the steps and pics of each step as I go. Since the paint has to dry for 24 hrs between coats it will be a LONG process. I figure I will do a coat each day after work.......so it will be 2 days of paint and a day of wet sanding times 3 or maybe times 4 depending on how many coats I will need to use for ample coverage.