I use it for everything. If it's fussy on the top, I use it in the bobbin.

I had the notion in my head that we should use only cotton thread for piecing and machine quilting. I will use up my polyester. Thanks for all the responses.

What would Grandma say?

If it meets the tug test, use it! Don't even have to do the matchy-matchy that we did when making clothes. Remember standing in front of the thread display matching to the closest possible? That's why most of us have boxes of thread.

I do the tug test and if it passes, I use it even if it is polyester.

I've learned to do the tug test on any and all threads before using them.

I usually can't tell by looking if thread is still strong or not.

I've used Coats and Clark cotton covered polyester Dual Duty thread for years (why did they quit making it?) and I have quilts that are over 20 years old that are our couch quilts - the bindings are frayed - but no fabric has been "cut" by the thread that was used.

Use it for just about anything. I like polyester thread as it does not cause a lint build up in the bobbin area. The only thing I don't use it for is miniatures as it is a bit heavy for that.

I only use cotton for quilting because its supposed to hold up on cotton fabric better. Poly has a tendency to eventually cut thru the fabric or deteriorate, break down, what ever its called. But that being said, lots of people love using it on quilting. I do use it for making garments

I have used poly thread for machine quilting (DSM) because I just couldn't find a particular color in cotton. It worked fine.

The prewound bobbins I use for piecing are poly, and I sometimes use poly on top -- no problem. I had some old, cheap poly from my mom (she used it for mending) that shredded so I pitched it, but Gutterman is a great poly.

It's versatile - over the years I've used it for machine piecing, hand piecing, machine quilting, hand quilting, machine satin stitch, hand applique.