Note: always use a pressing cloth when fusing your interfacing to fabric!
A mistake often made - we move the iron as though ironing - we need to press and hold in place then lift iron and press in another area.
Apply the interfacing by sandwiching the garment piece and interfacing between two press clothes to keep the ironing board and iron clean. Use a flat surface (particle board covered with several layers of wool and several layers of cotton works well).
Set the iron at the lowest temperature for steam, apply a lot of pressure and press for 10 seconds. Move the iron a small distance and repeat until you have covered every inch of the interfacing. Do not move until dry
Non-fusibles -Sew-In (also referred to as “sew-ins”) may be softer and less likely to change the hand of the fabric
Woven interfacings are available as fusibles and non-fusibles. All knit and weft insertion interfacings are fusible. The weight of the interfacing is an important consideration and is dependent on the fabric it will be used with, the style of the garment and your personal preference. If an interfacing is too light, it won’t do the job. If it is too heavy, it will change the character of the fabric.