new on here and this is my first post. We are wanting to do some walls in a bathroom of an 1860 house we purchased last summer.Looking to use a method called knockdon. Ihave no experience with this and have done a search for it on here,but haven't found what I'm looking for. How soupy should the mud be when I put in in the hopper gun? How long before I go back and use knife to knock it down? Any ideas would be greatly appreciatd. Thanks in advance