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Showerthought: Polyester thread ruins book sewing every time!
I used it on a cookbook I was fixing up for my grandma. The slick surface made the knots pop open after just a few page turns. I redid the binding with cotton thread and it's solid as a rock now. Trust me, natural thread is worth the extra few cents!
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miles3856mo ago
Polyester is just too slick and doesn't have any grip. It's the same reason it won't hold a knot well for sewing buttons either. The fibers don't absorb wax or conditioner like linen or cotton does, which helps lock stitches in place for the long haul. That tiny bit of friction from natural thread makes all the difference for binding.
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the_kevin6mo ago
Ugh, polyester is the worst for this! miles385 is totally right about the slickness. I tried it once on a notebook and the whole spine just gave up after a week. It's like trying to tie a knot in fishing line, it just slips. Cotton or linen thread bites into the paper and holds. Never going back.
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