Figure I'll do my weld seams with a special filler called "metal 2 metal" first, then epoxy prime the whole car, scuff and apply polyester filler where needed... Sand of course, then when I figure I'm close to straight I'll hit it with polyester prime, block the whole car, hit it again with polyester prime if need be... Then when I'm happy with the blocking I'll seal it, shoot the base, shoot the clear, block the clear and buff.
I just made myself tired just talking about that lol!!
But once you get to the guide coat you'll be grinning! Pulling the trigger on a topcoat smells just like money!!! The matching numbers on that rig makes what your doing worth the effort.