Finally, after several threads, this one for English Paper Piecing works for me. I tried silk, polyester and cotton. I know it's a personal choice but I read on a blog that they liked WonderFil Invisafil so I ordered it. It works so well. It does not knot and hides the seams very well. I only used for English paper, not on my machine. I will definitely be buying more for future projects.
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