I'm keeping it simple and easy to get done. not going to a mirror finish, just a factory level finish. I build drivers, Sir. I was going to use that dry guide coat until I realized you can't paint over it.....so it is ANOTHER step to get it off then put the mud when you took it off, then smooth it out then another guide coat then block. I just used black primer, mud the deepest bottoms, and use about 4-5 coats of the THICK primer filler made by duplicolor.....specially made for deep scratches. red oxide color. Not advocating any of this it's just experimentation and finding a way that works for me.
It will go quick this way. Mud only where needed. when you cover the whole panel, 90% is sanded right off. Using glaze, it sands so easy, I can block it with 220 grit within about a hour and have it ready for filler primer....will it be razor straight? No....but it will look pretty nice.