The reason it is coming out bubbled and textured with the plasti-dip is because you didn't follow the directions on the can or the ones here.
This isn't like shooting your normal rattle can spray paint....you have to spray ALOT one EACH coat to get the smooth finish. If you are trying to do building coats, it isn't going to be smooth. Spray until it is shiny smooth, then spray some more.
You are probably going to jack a panel or two up and have to remove it and start again before you get it down.
This is what it should look like when you are done, smooth finish with a slight rubbery feel....it shouldn't be textured at all.