I did the Herculiner roll on kit as well. I ended up putting a couple coats in the bed followed up with some touch ups.
This picture has the bed mat, but it shows the texture a little better:
I'm a sucker for trying to keep rocks off of my rocker panels too, so they got a healthy two coats as well.
All in all, there's over two gallons of the stuff on my truck. I love how it holds up, but it's all in the prep. A down side though is that it does fade in the sun. Mine didn't turn brown, but it is a flat black. Putting down a quick coat of black paint helps keep other colors from showing through.