Create a hem in the material by folding it to the desired width and press the hem with a hot iron.
Insert the double sided iron-on tape into the hem area between the layers of fabric. Avoid having your tape come in direct contact with your iron because it will melt on your iron and make a huge mess.
Allow the fabric to cool and check the seal. The tape fuses as it cools, so if you check your seal immediately after ironing while the fabric is still hot, it may not seem like it worked even if it did.Also, you have the potential for sliding or shifting the hem and messing it up.