Should the back with the canvas is not finished properly and looks rough then it is far better to avoid using such canvas. This also results within a weakness ultimately garments, causing it to get its shape or even fray and grow to be holey. Great for you . https://www.digitaljournal.com/pr/news/press-advantage/revolutionizing-contractor-license-education-contractors-state-license-center-shapes-the-future-in-los-angeles