Free Shipping on orders $49+

You are in: US | Other Countries: CAN AU NZ UK EU

4 Popular Thread Myths You Should Ignore

A title page for 4 popular thread myths you should ignore.

There’s a lot of sewing myths out there, and a lot of the time they were made because of a lack of thread technology advancement or there simply weren’t any other choices available. We’re going to debunk these 4 popular thread myths that are simply no longer true.

Thread Myth #1: Always Use the Same Thread Top & Bottom

One of the most common thread myths we hear is that you must always use the same thread on the top and in the bobbin. This is simply not true, and here’s why. As your machine sews, the top and bottom threads are pulling against each other for tension. By choosing a finer bobbin thread such as this 80wt cottonized polyester called DecoBob, the bobbin thread will always give way to the top thread. This allows for a smoother tension and fewer thread breakages.

A close up of a map

Description automatically generated

If you’re using a 50 or 40 weight thread to sew, which is the most common medium weight thread, the thread adds more extra bulk to the seams than most people realize. This 80wt bobbin thread is almost half the size of 50wt thread in comparison, and as a result will allow the stitches to lay flatter and the bobbin thread will show less.

A picture containing envelope

Description automatically generated

This is most especially noticeable in embroidery where you have a lot of dense stitching all in an area. In this embroidery, the top section used a 50wt white bobbin thread. Below it, we switched to a white 80wt pre-wound bobbin. You can literally see the difference it makes simply by choosing to use a finer thread in the bobbin.

A picture containing yellow, sitting, man, standing

Description automatically generated

Thread Myth #2: Embroidery Thread is Always 40wt Polyester

While we’re on the topic of embroidery, another thread myth we frequently hear is that an embroidery thread should always be a 40wt polyester. Don’t get us wrong, we love 40wt polyester for embroidery and it’s a great choice, but you can also achieve better results by changing up your thread depending on what kind of embroidery project you’re doing.

For instance, we stitched out several sizes of this embroidery pattern going from larger to smaller. The embroidery at the larger size looks great, however as you get smaller and smaller, you start to lose the detail and the lines become squished together. Any embroidery with many fine details benefits from using a finer thread. Here we used DecoBob 80wt thread in the top and bobbin and you can see how many details are kept at a smaller size.

A close up of a piece of paper

Description automatically generated

For another comparison, we stitched out some lace using a 50wt cotton. We then stitched out the same lace pattern using DecoBob 80wt thread and you can see how many more details show up in the lace with the finer thread. So if you’re doing any embroidery with a lot of little details, always choose a fine thread to make it with. The results are worth it.

A close up of a sign

Description automatically generated

However, polyester isn’t your only choice for embroidery thread, what about rayon? Rayon and polyester have some differences, namely that rayon has a more beautiful, glossy sheen in comparison to polyester which carries more of a fragmented, artificial sheen. Rayon is also softer and more flexible to the touch, while polyester is stiffer and rougher to the touch. However, polyester is also able to withstand mild bleaching and is resistant to most chemicals while rayon is not. Rayon also tends to weaken when exposed to water and should therefore just be used for decorative elements and not construction purposes.

A picture containing green, blue, white, sitting

Description automatically generated

These are both good choices for embroidery but knowing the properties of each material will help you make a more informed choice when choosing the best one for your project. Don’t forget that cotton thread is also a beautiful embroidery choice as it offers an organic, matte look. And metallic thread which is also a stunning choice for anything you want to pop.

Thread Myth #3: Metallic Threads Are Fickle and Always Break Too Easily

Metallic threads have a reputation for being fragile and difficult to sew with. However, it’s best to keep in mind that 1) not all metallic threads are made with the same quality, and 2) thread technology has advanced from the last few decades and many of the previous problems have now been addressed. This is Spotlite, a metallic thread made by WonderFil threads. Something that makes it unique is that it uses rayon for its core, meaning the metallic foil is wrapped around a core thread made of rayon.

A picture containing knife, food

Description automatically generated

Many companies opt for polyester as the core due to its strength, however we chose a rayon core because rayon has zero stretch to it. As polyester tends to carry more stretch to it, as the thread goes through all the bends in the machine, the thread can stretch around those corners, causing it to break. As rayon carries no stretch at all, this causes significantly fewer thread breaks and allows for a smooth sewing experience. It also means that stretching doesn’t pull the metallic foil away from the core, which would change the texture and reveal a different colour in the stitching.

We always recommend using a DecoBob 80wt pre-wound bobbin in the bottom with any metallic thread. As mentioned before, this will allow the bobbin to always give way to the top tension, resulting in fewer thread breaks and tension problems. Check out our video on sewing with metallic threads (without the headache) for a deeper look at sewing with metallic threads!

A picture containing indoor, table, photo, sitting

Description automatically generated

Thread Myth #4: Polyester Thread Cuts the Fabric So You Should Only Quilt with Cotton

This is one of the most common thread myths we hear because decades ago there was some truth to it. Since then, thread technology has made leaps and bounds in advancement, and polyester threads have become one of the easiest and best choices to sew with. Not only does the polyester thread not damage the fabric it is sewn into, it actually lasts longer and is more resilient than cotton over the years. It also carries next to no lint, meaning you’ll need to clean out your machine less frequently.

A picture containing blue, plane, airplane, bird

Description automatically generated

Always keep in mind that not all threads are made with the same quality. Many people spend thousands of dollars on a sewing machine only to feed it low quality thread that can cause all kinds of problems. Always choose a quality thread line to see the best results in your projects and save yourself the headache a low-quality thread can cause.

Let us know in the comment section if you learned something from this video or if you have your own thread myth to debunk. Inspired to sew with WonderFil threads? Head on over to for a list of stores and retailers you can purchase from. You can also sign up for our free newsletter to receive more educational sewing tips, tutorials, and free patterns. Register by clicking here! We’ll see you again next time!


Share the Post:

Related Posts