I've been reading and thinking about this. I bought a book that had a persons method and she doesn't use interfacing but everyone else does and I didn't risk it when I did my racing t shirt quilt or my daughters baby clothes quilt. When I get a long arm I am going to try one without and see how it goes cause the interfacing part sure takes a long time. If you doit without can you put a picture up after it's done and tell us what you think?