Part of the materials specified for this bag is iron-on interfacing. Interfacing is a type of fabric that reinforces parts of your projects and/or garments so that they can withstand pressure, weight, or other hard wear. It also stiffens fabric so that it can stand up on its own. When you make garments, interfacing is an important part of waistbands and collars.
For this project, we’re going to be using it on the strap, but that’s coming tomorrow. Today, I’m going to just explain how interfacing works so that you can proceed tomorrow without any issues.
I specified iron-on interfacing because, in my opinion, it’s the easiest kind to use. You can purchase sew-in interfacing, but to me, it seems like a hassle, especially if you’re just now starting to sew.
For the project I made for this tutorial, I purchased black iron-on interfacing. 90% of the time, I buy white interfacing, but it’s really hard to take pictures like I planned for this post and have them show up. As a rule, I feel that white interfacing can be used on everything. In a few circumstances, if the interfacing will show (like my daughter’s witch hat this Halloween), I use black. I will also mention that most people will never see your interfacing, unless the fabric’s very, very light, so use what’s convenient.
Iron on interfacing has 2 sides – the fabric side and the glue side. The fabric side looks like…fabric for lack of a better explanation. The glue side has tiny raised dots of glue that you can both see and feel. In the pictures below, the left picture is the “fabric” side while the right picture is the “glue” side.
Every one of those shiny dots is a little bit of glue that melts when heat is applied. To adhere it to your fabric, you’ll cut sections out that are a little smaller than your fabric and place them glue side down on the wrong side of the fabric. The great thing is that you don’t have to have one continuous piece of interfacing to get the job done. In most cases, you’ll only ever need to interface one side of an item rather than both. For the strap we’ll talk about tomorrow, I laid the piece of fabric on top of my interfacing to cut the first piece:
Then on an ironing board (I know that previous picture is on the cutting table, but anyway), I used my iron to press into each piece for at least 30 seconds. If you’re ironing a fabric that you feel will melt, I recommend keeping the iron moving, but not so much as to disturb any of the pieces. After I finished ironing all of them, I left my strap on the ironing board so that it could cool all the way. Once the piece was cooled, the interfacing was fully adhered and set.
I was then able to continue working on the strap as I’ll lay out tomorrow.