
I've tried clear nylon thread before but it kept breaking. After reading the positive reviews I purchased a spool of Superior Monopoly Clear Filament. I didn't get prewound bobbins (I have an old Singer 319w and wasn't sure if they would work) so I had to prewind my bobbin myself! It was difficult for me to see the thread at first, but after a few stitches I got the hang of it. The thread is thinner than regular polyester quilting and broke a few times when going through the seams while sewing. However, both cotton and polyester threads sometimes snap when sewing multiple layers of fabric. Attached is a photo of the COVID mask,

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