Originally Posted by
Candace
The only con I can think of is that high heat from an iron can melt it and break the stitching. Most people don't iron or press finished quilts, so that's not a problem. But, for piecing that can be an issue.
You are thinking of the old nylon thread. Polyester thread should not melt.
It is also a myth that poly thread tears the cotton fabric.
If your machine likes it, there is no reason not to use it (imho).