Start at 30:00 minutes on this Youtube Video: Budding, Grafting and Planting Walnut Trees - UCANR
The guy is real smart cause of life experiences. His whole video is worth watching for any grafter. Of course there is more than one way to bark grafts and you don’t need to follow his method. For me I like to use electrical tape as a seal vs. Farewell’s grafting seal or other paint on sealers. But, his process of thinking how to graft each tree as an individual, and explaining why he chose how to do what he’s doing is where his years of personal experience should be closely paid attention to the viewer.