I have not had wonderful results taping the nylon material, it works... but... well confidence in a little low with the method. Also, as Schmism points out..stretching can occur with some sewing machines feeding unevenly. This time around... I was prepared and did my homework and when we started setting up the new sail loft I got us a Pfaff dual action machine that feeds from the top and the bottom at the same time. The nylon material is good for many projects and I have high hopes that we will get good use of it in the future. It is not meant for competion sails for IOM's M's 10R's etc... but it does well for genoas and for inexpensive sails for smaller boats that are perfect for kids getting started and parents on a budget.