Thats a lot of steps. Standard body filler, primer, paint. If you need really thick, fiberglass reinforced will help, but really what you need is to redo the body work.
You only need glaze if you dont get a smooth finish in the plastic. Bondo will work in thin coats, it is supposed to crack easily in thicker. But tbh ive used it on several offroad projects and havent seen it happen. Back in the day i used golden extra for my nice projects, napa carries it. If its something that is going to see trail damage there js no point in spending a bunch of money or time.
Odds are im typing on a tablet. It takes too much effort to add some punctuation. Im lazy, get over it
Never underestimate the power of stupid.