yeah theres another version of that, the original my friend and I found was the "$50 paint job"

Rustoleum is a "self levelling paint" apparently, so you can roll it on and sand it and thats why it looks smooth without too much effort rolling it on. Apparently, there's a company making new automotive roll on paint, using more or less the same technology.

We painted a 1989 honda prelude black using rustoleum in his garage, rolling it on. I'm not kidding... made the car look 10000x better (but it looked like trash before, since he picked it up for $500 at a junkyard...) and yes it cost us $50