Answer
Mar 04, 2022 - 08:14 AM
Heat Seal is used as a stabilizer and 'iron on' material for after you embroider your patch and before you cut it out.
Heat Spun is designed for a backing/stabilizer for Patch Material before you embroider. (Note that Patch Twill does not require Heat Spun before embroidery)
You can see a video explaining this more here: https://colmanandcompany.com/Patches....
