What leveled17yeti said could have been said better. You need a perfect surface before you apply a coating otherwise it will look like turd for a long time. You can see here the results of the glass like finish if you take your time. And like Leveled17 said, toss the applicator out at the end of each session because it will scratch the hell out of the surface if you try to reuse it.
In this pic I did the drivers side and had not done the tailgate yet.