Dec 11, 2019 - 06:30 AM
Not recommended. You could try it. But Metallic thread is heavier than 40 wt. You would have to go very slowly and use at least a 90/14 Topstitch needle. But even with that, you will likely break threads a lot. On non-FSL designs you can enlarge the design slightly to use metallic, but that's never recommended with FSL.
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