Dear readers,
In my early sewing years, fusible interfacing was my mortal enemy. Partly because as a teenager in France I could not find the right kind, and partly because even when I had good interfacing, I could not get it to behave. It would bubble. It would lift at the corners. It would feel fine off the iron and then go wrong later.
Eventually the sourcing problem got solved. But the bubbling continued, until I was taught at FIT to let my interfaced pieces cool down completely before moving them. I know it sounds like nothing. It is not nothing.
Why cooling down matters
Fusible interfacing bonds as it cools, not when the iron is pressing down on it. The heat activates the adhesive and makes it soft. The bond forms as the piece returns to room temperature. If you pick up the piece while it is still hot or even warm, the glue is still soft, and you are pulling it away from the fabric before the bond has set.
This is why pieces can feel perfectly fused off the iron and still develop bubbles or lifting later. The bond was never fully set.
What to do instead
After pressing, put the piece down flat on your ironing surface or a nearby table. Give it a full minute to cool completely before you pick it up, fold it, or move it to the machine. That is all.
If you are working with multiple pieces, press one, set it aside to cool, and move on to the next. By the time you have fused the last piece, the first one is ready.
A note on layering interfacing
Once a piece has cooled and bonded fully, you can add a second layer of interfacing to specific areas if you need extra support, such as the button band on a shirt or the stay area of a collar. Building up in layers with full cooling time between them gives you much more control than trying to use one heavy piece of interfacing from the start. That is a Tiny Tip for another Tuesday.
Happy sewing,
Delphine