Superior Education

All About Bottom Line

  • Polyester Thread
  • Bobbin Thread
  • Lint Free

What is Bottom Line thread used for?

Bottom Line is a 60 wt./2-ply polyester thread that has been designed to be used as a bobbin thread. It's fine diameter helps it to blend well and its filament construction makes it extremely smooth, so it glides through fabric when stitched. As a lint-free thread, you will find that the blending tones seem to disappear into colored fabrics, creating a nearly-invisible presence.

Below are common questions and their answers pertaining to Bottom Line.

Q. Which colors of Bottom Line thread will act like an invisible thread?
A. If you want an almost invisible thread, without going to a monofilament thread like MonoPoly, use Bottom Line colors #623 Silver or #620 Cream when sewing or quilting on light-colored fabrics. The use of these thread colors on light-colored fabrics provides an almost invisible effect. If you are stitching on dark colored fabrics, we recommend Bottom Line #617.

Q. Can I used Bottom Line for free standing lace (the type of embroidery on water soluble stabilizer and doilies)?
A. Yes! The Bottom Line thread is marvelous for machine stand alone lace embroidery and free standing lace. We recommend using Bottom Line in both the top and bobbin for this application. The finished design is soft and fine.


Bottom Line polyester thread

Q. Can I quilt with Bottom Line in the top thread and bobbin thread at the same time?
A. Absolutely. Many quilters will use Bottom Line as a top thread for stitch in the ditch and dense quilting. Even though Bottom Line has been designed to be used as a bobbin thread, it can (and should) be used as a top thread in many different applications.

Q. How can I accurately match my bobbin colors to my top thread? I think this is harder to do than I initially thought it would be.
A. Please view our Color Compatibility Charts. We've matched similar colors across thread lines and have created handy reference guides.

Q. I'm hoping you can shed some insight on a topic that came up at my local quilt shop today. One lady stated that thread is directional. More smooth in one direction, more rough in another. That you can never use thread that's wound on a bobbin on the top of your machine because it's wound from the wrong direction, that you'll have more thread breaks. Further saying that when you are hand sewing your knot needs to be on the end that first comes off of your spool. That you'll have more shredding if you put your needle on the thread first, then pull and tie your knot where snipped.
A. This is quite a story. While the effects of what she told could be a symptom of low-quality threads, there isn't truth thread only working properly in one direction. Low quality threads don't have a tight twist and as such, can unravel and cause all sorts of problems. A high-quality thread will have a tight twist and a nice, smooth finish.

Q. I had a friend tell me she was going to quilt with serger poly thread. She thinks it should be equal to a So Fine! #50 or Bottom Line thread because they are all polyester threads. I told her it is a different quality and not to do it. Do you have a better answer for me to give her?
A. Most serger thread is on the cheaper end of the scale, using lower quality spun polyester fibers. This type of thread is OK (still not the best) to use with a serger where multiple strands overlock and form the stitch. A corespun polyester serger thread, like Sergin' General, is recommended due to its strength, tighter twist, and lower amount of lint. With that said, we do not recommend sewing or quilting with cheap serger thread because of its high lint displacement, lower strength, and looser twist. So Fine! #50 is not spun polyester, but multifilament polyester, just like Bottom Line.

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